ESP32-C3-DevKit-Lipo is EUR 6.00 Open Source Hardware compact development board with:
RISC-V running on 160Mhz
400KB RAM, 8K data RAM
4MB Flash
Two headers (soldered) with power supply and GPIO signals
ESP-PROG-C compatible rescue connector (if you mess with bootloader)
USB-C for programming and JTAG debugging
LiPo battery charger allowing handheld applications with single LiPo battery
4 mount holes
This is all you need to get started with RISC-V programming in C and Assembly.
Shteryana Shopova recently did RISC-V workshop with this board and explained how to setup your tools for programming and debugging. Here you can find her work.
Recently we are experimenting with Home Assistant installed on A20-OLinuXino-LIME2 Home server and attaching different nodes made with our ESP8266/ESP32 boards and noticed odd behaviour os ESP when WIFI router is set on the higher frequencies channels.
Most of WiFi router default settings are with channel Auto selection, this means the router will try first Channel 1 if too much noise and drop packets due to overwhelmed with WiFi devices area will change it up and so on, so our developers decided that it’s smart idea to use the WiFi router on the highest possible channel. This will guarantee that this channel will be most noise and interference free from other WiFi devices. So our router was set to WiFi channel 13:
We use the ESP standard firmware and ESPhome code. This is what happens: When the code is flashed for first time, it experience some errors while connecting but manage to connect to the router.
Access Point: TP Link
Hardware Version: Archer C1200 v2.0
Firmware Version: 2.0.0 Build 20170206 rel.46023 (EU)
SUCCESS CH13 (first attempt after flashing the code)
============================
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -40 dB
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Association Expired'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:479]: Event: Disconnected ssid='OlimexTenda' reason='Probe Request Unsuccessful'
[W][wifi:533]: Error while connecting to network.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -52 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Association Leave'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[I][wifi:502]: WiFi Connected!
[C][wifi:350]: Local MAC: 18:FE:34:9C:61:DE
[C][wifi:351]: SSID: 'OlimexTenda'
[C][wifi:352]: IP Address: 192.168.0.203
[C][wifi:354]: BSSID: B0:4E:26:6E:B2:73
[C][wifi:355]: Hostname: 'esp8266-evb-pir-9c61de'
[C][wifi:357]: Signal strength: -56 dB
[C][wifi:361]: Channel: 13
[C][wifi:362]: Subnet: 255.255.255.0
[C][wifi:363]: Gateway: 192.168.0.1
[C][wifi:364]: DNS1: 192.168.0.1
[C][wifi:365]: DNS2: 0.0.0.0
[D][wifi:511]: Disabling AP...
As you can see from the above the ESP try to connect twice but gets error: ‘Association Expired’ and ‘Probe Request Unsuccessful’ but on the third attempt it connects.
The problem comes later if for some reason ESP lose power and start again. This could easily happen if the ESP is powered by the mains and there is power blackout and power restore.
FAILURE CH13 (after cold restart)
=================================
[C][wifi:037]: Setting up WiFi...
[D][wifi:046]: Loaded saved wifi settings: OlimexTenda
[D][wifi:370]: Starting scan...
[D][binary_sensor:036]: 'PIR Sensor': Sending state OFF
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -55 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[W][wifi:568]: Restarting WiFi adapter...
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[W][wifi:568]: Restarting WiFi adapter...
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -54 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[W][wifi:568]: Restarting WiFi adapter...
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[W][wifi:568]: Restarting WiFi adapter...
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -52 dB
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[W][wifi:568]: Restarting WiFi adapter...
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[I][wifi:135]: Starting fallback AP!
[C][wifi:198]: Setting up AP...
[C][wifi:200]: AP SSID: 'esp8266-evb-pir-9c61de'
[C][wifi:201]: AP Password: ''
[C][wifi:210]: IP Address: 192.168.4.1
[W][wifi:527]: Timeout while connecting to WiFi.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -57 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Association Leave'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi:527]: Timeout while connecting to WiFi.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -56 dB
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Association Leave'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:479]: Event: Disconnected ssid='OlimexTenda' reason='Probe Request Unsuccessful'
[W][wifi:533]: Error while connecting to network.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -51 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[W][wifi:439]: No matching network found!
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -54 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -53 dB
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'ESP_CA17E1' (8C:4B:14:CA:17:E1)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -54 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -53 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[W][wifi_esp8266:213]: wifi_apply_hostname_(esp8266-evb-pir-9c61de): lwIP error -16 on interface st (index 0)
[W][wifi_esp8266:483]: Event: Disconnected ssid='OlimexTenda' bssid=B0:4E:26:6E:B2:73 reason='Auth Expired'
[W][wifi:533]: Error while connecting to network.
[D][wifi:370]: Starting scan...
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 13
[D][wifi:431]: RSSI: -53 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
As seen from the log above, after power cycling ESP can’t connect to WiFi router anymore, most of the errors shown are ‘Auth Expired’
If we change the WiFi router settings to Channel 1-11:
All problems now are gone and ESP connects every time no matter how many time power is cycled.
SUCCESS CH11 (after cold restart)
=================================
[D][wifi:046]: Loaded saved wifi settings: OlimexTenda
[D][wifi:370]: Starting scan...
[D][binary_sensor:036]: 'PIR Sensor': Sending state OFF
[D][wifi:385]: Found networks:
[I][wifi:429]: - 'OlimexTenda' (B0:4E:26:6E:B2:73)
[D][wifi:430]: Channel: 11
[D][wifi:431]: RSSI: -54 dB
[D][wifi:434]: - 'Haxor' (B0:48:7A:CE:8D:BC)
[D][wifi:434]: - 'OlimexGuests' (C8:3A:35:4B:10:78)
[D][wifi:434]: - 'OlimexAP' (00:1F:1F:11:7B:B3)
[D][wifi:434]: - 'OlimexTest' (78:32:1B:90:D7:38)
[D][wifi:434]: - 'ubnt' (00:27:22:7C:3C:70)
[I][wifi:245]: WiFi Connecting to 'OlimexTenda'...
[I][wifi:502]: WiFi Connected!
[C][wifi:350]: Local MAC: 18:FE:34:9C:61:DE
[C][wifi:351]: SSID: 'OlimexTenda'
[C][wifi:352]: IP Address: 192.168.0.203
[C][wifi:354]: BSSID: B0:4E:26:6E:B2:73
[C][wifi:355]: Hostname: 'esp8266-evb-pir-9c61de'
[C][wifi:357]: Signal strength: -55 dB
[C][wifi:361]: Channel: 11
[C][wifi:362]: Subnet: 255.255.255.0
[C][wifi:363]: Gateway: 192.168.0.1
[C][wifi:364]: DNS1: 192.168.0.1
[C][wifi:365]: DNS2: 0.0.0.0
[D][wifi:511]: Disabling AP...
[C][ota:082]: Over-The-Air Updates:
[C][ota:083]: Address: esp8266-evb-pir.local:8266
[C][api:025]: Setting up Home Assistant API server...
[I][app:060]: setup() finished successfully!
[I][app:099]: ESPHome version 2021.11.4 compiled on Dec 9 2021, 11:08:14
[I][app:101]: Project olimex.esphome-esp8266-evb-pir version 1.0
[C][wifi:488]: WiFi:
[C][wifi:350]: Local MAC: 18:FE:34:9C:61:DE
[C][wifi:351]: SSID: 'OlimexTenda'
[C][wifi:352]: IP Address: 192.168.0.203
[C][wifi:354]: BSSID: B0:4E:26:6E:B2:73
[C][wifi:355]: Hostname: 'esp8266-evb-pir-9c61de'
[C][wifi:357]: Signal strength: -55 dB
[C][wifi:361]: Channel: 11
[C][wifi:362]: Subnet: 255.255.255.0
[C][wifi:363]: Gateway: 192.168.0.1
[C][wifi:364]: DNS1: 192.168.0.1
[C][wifi:365]: DNS2: 0.0.0.0
[C][logger:233]: Logger:
[C][logger:234]: Level: DEBUG
[C][logger:235]: Log Baud Rate: 115200
[C][logger:236]: Hardware UART: UART0
[C][gpio.binary_sensor:015]: GPIO Binary Sensor 'PIR Sensor'
[C][gpio.binary_sensor:015]: Device Class: 'motion'
[C][gpio.binary_sensor:016]: Pin: GPIO16
[C][captive_portal:151]: Captive Portal:
[C][ota:082]: Over-The-Air Updates:
[C][ota:083]: Address: esp8266-evb-pir.local:8266
[C][api:134]: API Server:
[C][api:135]: Address: esp8266-evb-pir.local:6053
[C][api:139]: Using noise encryption: NO
[C][mdns:084]: mDNS:
[C][mdns:085]: Hostname: esp8266-evb-pir-9c61de
Our blind guess is that ESP can’t connect reliable on the higher frequency channels. As far as you choose channels 1-11 everything is fine. We think that most people even do not notice this kind of erros if they routers are set to Auto channels as the chances to go up to 12-13-14 are very slim.
ESP32-S2 is new SOC from Espressif which fills the gap between ESP32 and ESP8266.
It has the same memory model as ESP32 but has cut the Ethernet and Bluetooth parts, so only WiFi connection is possible – same as ESP8266, but offers more power, secure boot and encrypted firmware. Also support of decent SSL connection, something which lacks in ESP8266.
Pricewise now S2 is a bit lower cost than ESP32 and more expensive than ESP8266, but there is very strong competition in this niche coming from the new Bouffalo BL6XX chips, so my prediction is that to stay ahead Espressif will further lower the prices of ESP32-S2 to match ESP8266 very soon.
For comparison with ESP32 and ESP8266 the new ESP32-S2 has plenty of GPIOs up to 43!
Initially Espressif has announced that their ESP32-S2-WROVER modules will have as low as 2-4uA consumption, but later they increased this value to 20uA. Not quite well as their target but still very good achievement.
To keep compatibility with SAOLA-1 we add RGB LED, but also add LiPo battery charger and ESP32-S2-DevKit-Lipo can operate even without external power supply only on LiPo battery, there is battery level monitoring and external power supply sense. ESP32-S2-DevKit-Lipo can power external circuits with 3.3V up to 200mA when operate on battery.
ESP32-S2-DevKit-Lipo has build in programmer with CH340T. There is possibility the programmer part to be excluded and to use ESP32-S2 directy USB connection.
When operating on battery if the RGB LED is enabled the power consumption is ridiculous 700uA as the RGB LED appear to use lot of current even when not in operation, but there is RGB disable solder jumper which if opened you will not be able to operate the RGB LED on battery but will decrease the power consumption to total less 30uA in deep sleep.
With ESP32-WROOM-B module with 8MB RAM and 4MB of Flash, two microphones, two 3W speakers, codec, amplifier, Lipo charger, USB with programming, Audio 3.5mm jack, ESP32-ADF board offers everything you need to start playing with Espressif Audio Development Framework.
Today we made our first Alexa prototype:
and we spoke with ESP32-ADF running WiFi SIP phone, you do not need PC to make free calls all around the world to other people with VoIP phones!
Surprisingly there was no any lag caused by the WiFi and it works as good as the commercial wired SIP VoIP phones.
We add now MOD-LCD2.8RTP with touch screen on ESP32-ADF UEXT connector and write some nice graphical UI then will upload the VoIP phone demo code next week.
We do same for the Internet Radio player demo – nice graphical UI, so user can select which radio station to connect to.
ESP32-WROOM-32D-4MB – this is equal to used by us ESP32-WROOM-32, it uses D0WD instead of D0WDQ6 which is with smaller size and Espressif recommend it for new designs.
ESP32-WROOM-32D-16MB has 16MB of Flash
ESP32-WROOM-32D-4MBHT is High temperature +105C module for demanding applications.
ESP32-WROOM-32U-4MB is with U.FL connector for external antenna
ESP32-WROOM-32U-16MB has 16MB of Flash
ESP32-WROOM-32U-4MBHT is High temperature +105C module for demanding applications.
ESP32-WROVER-4MB has 4MB Flash and 8MB of PSRAM.
The high temperature modules are still not in stock as Espressif manufacture these now, but all others are in stock.
ESP32-DevKit-Lipo is pin to pin compatible with Espressif ESP32-CoreBoard (ESP32-DevKitC) board, but adds additional LiPo charger and battery connector, allowing board to work from LiPo battery when external power supply is missing.
Tomorrow 16.10 at SofUnitConf in Paradise Center in Sofia we will have Workshop with this board to show how easily it could be programmed with JavaScript and Espruino.
ESP32-POE board is now in stock. The prices start from EUR 14.36 for 50 pcs order.
This board offers Open Source Hardware / FOSS solution and building block for distributed sensor network with power over existing LAN infrastructure.
Possible use cases are Home automation, Industrial machine logging, remote environmental monitoring, access control, remote displays etc.
The board contains ESP32-WROOM-32 module with WiFi/BLE and Ethernet connectivity , RESET and USER buttons, micro SD card, LiPo battery charger and LiPo connector which allow board to work even with power supply drops.
The UEXT connector on the board can be used to connect many different sensors like:
Si3402-B chipset takes care for the power over ethernet, it’s IEEE 802.3 compliant, including pre-standard (legacy).
Important notice, to keep board compact and as it’s main purpose is to connect to cloud different remote sensors there is no galvanic isolation between board and the power delivered by the LAN switch or router.
ESP32-POE has internal programming interface and you can program it with Espressif SDK or Arduino via USB cable. As the board is not galvanic isolated from the Ethernet power supply, before you connect the USB cable to your computer you should remove the Ethernet cable or you should use USB-ISO between your computer the ESP32-POE!
Few years ago Espressif released their first low cost WiFi chip ESP8266 and turned upside down the WiFi connectivity for small MCU. They have been left relatively to no competition from the big Western chip makers who couldn’t match their aggressive pricing, but later there was semi successful competition from Realtek and now there is another competitor who is focused on low cost IoT audio applications but their chip is quite good for general purpose WiFi stuff also. The RDA5981 is based on Cortex-M4 inside
running at 160Mhz
160KB SRAM
8MB PSRAM
4MB Flash
build in USB 2.0 host interface allow USB devices to be connected to the module directly which is advantage toward Espressif chips
Support Bluetooth 2.1 EDR + BLE4.2
SDMMC interface
2x 10bit ADCs
SIDO x1, I2C x1, I2S x2, PWM x8, IR, SPI x4, UART x2, GPIO with interrupts x14
operating temperature -30+80C
According to the PR message their focus is voice recognition / audio play and they shipped already 200 Millions of these chips ин 2016. Looking at the features above they can be used for other IoT applications as well if their SDK is easy enough to use by maker community. The question is will be they smart enough to be more user friendly as ESP.
I check their web and even to download their datasheet they require registration :). I understand this as – we hide our product info from our potential customers as we do not want they to evaluate our chips. These registrations beside pissing off potential customers do not hide anything from their competitors as they would easily register with fake info and get them anyway, but obvious this is the way most Chinese companies work.
via Twitter (Thanks to Rudi!)
EDIT 10-01-2018: There is actually GitHub repo with the datsheet, so their web may be not updated!
AR9721 chipset is the only one on the market with completely open source linux drivers and firmware, this make it WiFi chipset of choice for people who respect their freedom.
We have MOD-WIFI-AR9721-ANT for quite some time and it’s very popular item, but the 200mm antenna make it not quite small. Now we add to our web shop the version without external antenna. It’s with 85 x 25 x 10 mm dimension and have same working distance as the external antenna version.
olimex 
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