This looks like an interesting board. May be a good upgrade for the 8266
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Yes I saw that too. Apparently, pin compatible. I will try and get a board and see how it works.
I have gotten the sketch working on ESP32. So it should be pretty simple to get working.
I have a new board on the way that uses a smaller form factor MCU. It will support either Seeed XIAO RP2040 or Adafruit QT Py ESP32-S2.
I havenāt yet worked on running the sketch on the Seeed XIAO, but as itās pin compatible with the QT Py and runs Ardiuno code, it should be trivial to get working. I like these boards as they are the size of a postage stamp and as powerful, maybe more so than the Wemos boards.
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Apparently thereās a hardware issue with V1.0.0
Currently testing V2.1.0 (received it yesterday) and itās great so far.
Any news about compatibility with airgradient board? Iām waiting mine to arrive from JLCPCB
We are working on making the AirGradient Arduino library compatible with ESP32 boards.
The current library does not work with these chips.
Iām really interested in this. Using esphome, it should be possible to use it for not just airgradient, but adding bluetooth_proxy which could be handy given airgradients are likely scattered around. 2 tasks with one device.
I received by Pro (non soldered) kit very recently and have been having trouble uploading firmware with ESPHome as it times out very often. I have absolutely no time out issues with any of my other ~30 ESP boards. The board that came with the kit is a Lolin D1 āMimiā which is based on the 8266 so I figured Iād try to replace it with a pin compatible ESP32 S2 Mini or an ESP32-WROOM-32 ESP Mini 32 (no idea on brand or proper nameā¦).
ESP32 S2:
The OLED display, PMS5003 and SHT3X all worked fine but I just could not get UART1 for the CO2 sensor to work.
ESP32 WROOM 32 (Mini)
Everything works perfectly and it is pin compatible so no mods necessary.
Note: Sorry for terrible picā¦ camera on my S20Ultra is awful.
Edit:
Nevermindā¦ it works but now I cannot close the enclosure without modifying it as the corner where the LEDs are interferes with the recessed part of the enclosure or removing the PCB corner where the power led is (likely not an issue to do so but I am not sure I want to). The ESP32 S2 fits perfectly but I canāt get the UART1 to workā¦ 
Edit2: Creative and careful use of a Dremel on both the ESP32 board and the enclosure solved the problem.
This is very interesting as we want to make the board ESP32 compatible.
There are D1 ESP32 based modules that are smaller and should not have the problem that we need to adjust the enclosure, e.g.
S2 Mini
or
C3 Mini
Would you like to share the code adjustments you made?
@AirGradient - I have an ESP32 S2 Mini but I could not get UART1 to work as stated above. I did not see any errors so I did not know what else to try.
I do not have a C3 Mini and I did not find any on amazon so I canāt test that one.
My ESPHome code is for the ESP32-WROOM-32 that is a bit too large to fit (I modified both the board and the case and it fits now):
Note: Code is still work in progressā¦
substitutions:
devicename: "air-quality-sensor"
devicename_no_dashes: "air_quality_sensor"
friendly_devicename: "Air Quality Sensor"
device_description: "Air Gradient Air Quality Sensor"
update_interval_s: "2s"
update_interval_wifi: "120s"
esphome:
name: "${devicename}"
comment: "${device_description}"
# Automatically add the mac address to the name
# so you can use a single firmware for all devices
# name_add_mac_suffix: true
esp32:
board: nodemcu-32s
framework:
type: arduino
# Enable logging
logger:
# Enable Home Assistant API
api:
password: !secret api_pwd
ota:
password: !secret ota_pwd
wifi:
networks:
- ssid: !secret iot_wifi_ssid
password: !secret iot_wifi_password
reboot_timeout: 15min
#Faster than DHCP. Also use if can't reach because of name change
manual_ip:
static_ip: 192.168.3.212
gateway: 192.168.3.1
subnet: 255.255.255.0
dns1: 192.168.1.25
dns2: 192.168.1.26
#Manually override what address to use to connect to the ESP.
#Defaults to auto-generated value. Example, if you have changed your
#static IP and want to flash OTA to the previously configured IP address.
# use_address: 192.168.3.212
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "${devicename}"
password: !secret iot_wifi_password
web_server:
port: 80
include_internal: false
switch:
- platform: restart
name: "${friendly_devicename}: Restart"
- platform: template
name: "Calibrate CO2 Sensor"
id : "calibrate_co2_sensor"
disabled_by_default: true
turn_on_action:
- senseair.background_calibration: co2_sensor
- logger.log: "CO2 Sensor Calibration Triggered! Must be done OUTDOORS!"
- platform: template
name: "CO2 Sensor Calibration Result"
id : co2_sensor_calibration_result
disabled_by_default: true
turn_on_action:
- senseair.background_calibration_result: co2_sensor
button:
- platform: safe_mode
name: "${friendly_devicename}: Restart (Safe Mode)"
captive_portal:
# Sync time with Home Assistant
time:
- platform: homeassistant
id: ha_time
text_sensor:
- platform: wifi_info
ip_address:
name: "${friendly_devicename}: IP"
icon: "mdi:ip-outline"
update_interval: ${update_interval_wifi}
ssid:
name: "${friendly_devicename}: SSID"
icon: "mdi:wifi-settings"
update_interval: ${update_interval_wifi}
bssid:
name: "${friendly_devicename}: BSSID"
icon: "mdi:wifi-settings"
update_interval: ${update_interval_wifi}
mac_address:
name: "${friendly_devicename}: MAC"
icon: "mdi:network-outline"
scan_results:
name: "${friendly_devicename}: Wifi Scan"
icon: "mdi:wifi-refresh"
disabled_by_default: true
#https://esphome.io/guides/automations.html?highlight=restore_value#bonus-2-global-variables
globals: ##to set default reboot behavior
# Wifi variables
- id: wifi_connection
type: bool
restore_value: no
initial_value: "false"
i2c:
sda: 21 #D2
scl: 22 #D1
uart:
- rx_pin: 18 #D5
tx_pin: 19 #D6
baud_rate: 9600
id: uart1
- rx_pin: 16 #D4
tx_pin: 17 #D3
baud_rate: 9600
id: uart2
font:
# gfonts://family[@weight]
- file: "gfonts://Roboto"
id: roboto
size: 12
- file: "gfonts://Roboto"
id: roboto_symbols
size: 12
glyphs: [
"\U000000B5", #Āµ
"\U00000067" #g
]
- file: "gfonts://Roboto"
id: roboto_medium
size: 16
- file: "gfonts://Roboto"
id: roboto_large
size: 32
- file: "fonts/materialdesignicons-webfont.ttf"
id: wifi_icon_font
size: 12
glyphs: [
"\U000F05A9", #wifi
"\U000F05AA" #no wifi
]
- file: "fonts/materialdesignicons-webfont.ttf"
id: face_icon_font
size: 48
glyphs: [
"\U000F01F5", #mdi-emoticon-happy-outline
"\U000F01F6", #mdi-emoticon-neutral-outline
"\U000F01F8" #mdi-emoticon-sad-outline
]
# https://www.co2meter.com/blogs/news/co2-levels-at-home
# ~400 ppm background (normal) outdoor air levels
# 400- 1,000 ppm typical levels found in occupied spaces with good air exchange
# 1,000 ā 2,000 ppm levels associated with complaints of drowsiness and poor air
# 2,000 ā 5,000 ppm levels associated with headaches, sleepiness, and stagnant, stale, stuffy air,
# poor concentration, loss of attention, increased heart rate and slight nausea may also be present
# >5,000 ppm Exposure may lead to serious oxygen deprivation symptoms
display:
- platform: ssd1306_i2c
id: device_display
model: "SH1106 128x64"
address: 0x3C
rotation: 180
flip_x: false
flip_y: false
offset_y: 0
offset_x: 0
external_vcc: true
update_interval: 1s
pages:
- id: page1
lambda: |-
it.rectangle(0, 0, 128, 64);
it.printf( 6, 8, id(roboto_medium), "CO2 ");
it.printf( 92, 8, id(roboto_medium), TextAlign::TOP_RIGHT, "%5.0f", id(co2).state);
it.printf(120, 11, id(roboto), TextAlign::TOP_RIGHT, "ppm");
it.line( 0, 32, 128, 32);
it.line(64, 32, 64, 128);
it.printf( 4, 34, id(roboto), "C");
it.printf( 68, 34, id(roboto), "RH");
it.printf( 54, 40, id(roboto_medium), TextAlign::TOP_RIGHT, "%3.1fĀ°", id(temp).state);
it.printf(120, 40, id(roboto_medium), TextAlign::TOP_RIGHT, "%2.0f%%", id(humidity).state);
- id: page2
lambda: |-
it.rectangle(0, 0, 128, 64);
it.printf(4, 4, id(roboto_medium), "PM 1: ");
it.printf(105, 4, id(roboto_medium), TextAlign::TOP_RIGHT, "%4.0f", id(pm1_0).state);
it.printf(124, 7, id(roboto_symbols), TextAlign::TOP_RIGHT, "Āµg");
it.printf(4, 23, id(roboto_medium), "PM 2.5: ");
it.printf(105, 23, id(roboto_medium), TextAlign::TOP_RIGHT, "%4.0f", id(pm2_5).state);
it.printf(124, 26, id(roboto_symbols), TextAlign::TOP_RIGHT, "Āµg");
it.printf(4, 42, id(roboto_medium), "PM 10: ");
it.printf(105, 42, id(roboto_medium), TextAlign::TOP_RIGHT, "%4.0f", id(pm10_0).state);
it.printf(124, 45, id(roboto_symbols), TextAlign::TOP_RIGHT, "Āµg");
- id: page3
lambda: |-
it.rectangle(0, 0, 128, 64);
if (id(co2).state <= 1000.0 && id(pm2_5).state < 35 ) {
it.printf(8, 8, id(face_icon_font), "%s", "\U000F01F5"); //mdi-emoticon-happy-outline
it.printf(76, 14, id(roboto_medium), "ALL");
it.printf(68, 34, id(roboto_medium), "GOOD");
} else if (id(co2).state > 1000.0 && id(co2).state < 2000.0 || id(pm2_5).state >= 35 && id(pm2_5).state <= 50) {
it.printf(8, 8, id(face_icon_font), "%s", "\U000F01F6"); //mdi-emoticon-neutral-outline
it.printf(74, 14, id(roboto_medium), "NOT");
it.printf(68, 34, id(roboto_medium), "GOOD");
} else {
it.printf(8, 8, id(face_icon_font), "%s", "\U000F01F8"); //mdi-emoticon-sad-outline
it.printf(72, 14, id(roboto_medium), "NOT");
it.printf(68, 34, id(roboto_medium), "SAFE");
}
interval:
- interval: 10s
then:
- display.page.show_next: device_display
- component.update: device_display
- interval: 20s
then:
if:
condition:
wifi.connected:
then:
- globals.set:
id: wifi_connection
value: 'true'
else:
- globals.set:
id: wifi_connection
value: 'false'
sensor:
- platform: wifi_signal
name: "${friendly_devicename}: WiFi Signal"
update_interval: ${update_interval_wifi}
device_class: signal_strength
- platform: sht3xd
temperature:
id: temp
name: ${friendly_devicename} Temperature
humidity:
id: humidity
name: ${friendly_devicename} Humidity
address: 0x44
update_interval: 10s
- platform: pmsx003
type: PMSX003
uart_id: uart1
pm_1_0:
id: pm1_0
name: "${friendly_devicename}: Particulate <1.0Āµm"
pm_2_5:
id: pm2_5
name: "${friendly_devicename}: Particulate <2.5Āµm"
pm_10_0:
id: pm10_0
name: "${friendly_devicename}: Particulate <10.0Āµm"
- platform: senseair
id: co2_sensor
uart_id: uart2
co2:
id: co2
name: "${friendly_devicename} CO2"
update_interval: 60s
1 Like
I certainly want to come back and try out your esphome code!
I bought a Lolin C3 mini v2.1.0. It was really tricky to find how to get it to run esphome for air gradient. I thought I should share the necessary changes, in case anyone else wants to try.
esphome:
name: air-gradient
platformio_options:
board_build.flash_mode: dio
esp32:
board: esp32-c3-devkitm-1
framework:
type: esp-idf
version: recommended
variant: esp32c3
logger:
level: DEBUG
hardware_uart: USB_SERIAL_JTAG
The last line is needed to get serial output. The flash mode was needed to allow me to flash it. Rest should be self explanatory, otherwise please ask.
With the Lolin C3 mini I have a bug. Most reads from the Co2 sensor fail with
17:04:16.100 > [E][uart:015]: Reading from UART timed out at byte 0!
17:04:16.102 > [W][senseair:024]: Reading data from SenseAir failed!
The problem reminds of S8 CO2 reading of -1 - #99 by AirGradient (but is subtly different). I did not find a solution to the issue and appreciate any advice one might have.
On the bright side: with the C3 I can run a esphome configuration with historic graphs which also forwards the data on mqtt. This solves one of the issues I had documented in Esphome with graphs
I picked up both a S2 mini and a C3 mini to test them as replacements for the included 8266 with esphome (like many others, Iāve been experiencing frequent/random reboots with the included D1 mini). After figuring out how to flash them and getting them working with esphome, I ran into the same SenseAir issues as @argafal. But interestingly - I found that if you flipped the order of the UARTs in the esphome config, then the senseair would start working properly and the PMS would stop. So that made it clear that this isnāt an issue with pin compatibility with the hardware UARTs or anything like that.
I figured out what was going on. Both the S2 and C3 boards have two hardware UARTs (unlike the full ESP32 which has three). In order to have hardware logging, esphome reserves the first (UART0) for the logger. Even if you disable hardware logging (by setting baud_rate to 0) or disable the logger entirely, it still wonāt assign UART0 to anything else. The PMS sensor, first in the list, was assigned UART1, and the SenseAir was assigned UART2, which isnāt functional on these boards.
I just submitted a pull request to esphome that changes this behavior, and allows UART0 to be assigned if the logger isnāt using it. To use these boards on the AirGradient, you have to give up hardware serial logging, but all the sensors will work (and you can still get logs over wireless). And importantly, it works reliably and the reboot issue went away (yay!). I found that both the S2 and C3 worked well with this change.
If anyone wants to try it out, hereās my esphome config for the S2 mini:
esphome:
name: airgradient
friendly_name: AirGradient
platformio_options:
board_build.extra_flags:
- "-DARDUINO_USB_CDC_ON_BOOT=0" # Needed to compile
# Remove once this is merged: https://github.com/esphome/esphome/pull/4762
external_components:
- source: github://spectrumjade/esphome@esp32s2_uart_fix
components: [ uart ]
refresh: 0s
esp32:
variant: esp32s2
board: lolin_s2_mini
framework:
type: arduino
# Enable logging
logger:
level: DEBUG
baud_rate: 0 # Disable hardware logging so that we can use both UARTs
# Enable Home Assistant API
api:
ota:
password: !secret ota_update_password
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "airgradient"
password: !secret ap_fallback_password
captive_portal:
i2c:
sda: 33
scl: 35
frequency: 100kHz
font:
- file: "gfonts://Roboto@light"
id: roboto12
size: 12
display:
- platform: ssd1306_i2c
id: oled
address: 0x3c
model: "SH1106 128x64"
pages:
- id: page1
lambda: |-
it.print(0, 0, id(roboto12), "Temperature");
it.print(0, 15, id(roboto12), "Humidity");
it.print(0, 30, id(roboto12), "PM2.5");
it.print(0, 45, id(roboto12), "CO2");
it.printf(it.get_width(), 0, id(roboto12), TextAlign::TOP_RIGHT, "%.1f Ā°F", id(temp_f).state);
it.printf(it.get_width(), 15, id(roboto12), TextAlign::TOP_RIGHT, "%.0f%%", id(humidity).state);
it.printf(it.get_width(), 30, id(roboto12), TextAlign::TOP_RIGHT, "%.0f ug/m3", id(pm25).state);
it.printf(it.get_width(), 45, id(roboto12), TextAlign::TOP_RIGHT, "%.0f ppm", id(co2).state);
- id: page2
lambda: |-
it.print(0, 0, id(roboto12), "PM1");
it.print(0, 15, id(roboto12), "PM2.5");
it.print(0, 30, id(roboto12), "PM10");
it.printf(it.get_width(), 0, id(roboto12), TextAlign::TOP_RIGHT, "%.0f ug/m3", id(pm10).state);
it.printf(it.get_width(), 15, id(roboto12), TextAlign::TOP_RIGHT, "%.0f ug/m3", id(pm25).state);
it.printf(it.get_width(), 30, id(roboto12), TextAlign::TOP_RIGHT, "%.0f ug/m3", id(pm100).state);
# Set an interval to loop through the OLED screens.
interval:
- interval: 5s
then:
- display.page.show_next: oled
- component.update: oled
switch:
- platform: template
name: Display
id: display_enabled
icon: "mdi:fit-to-screen"
entity_category: config
lambda: |-
if (id(oled).is_on()) {
return true;
} else {
return false;
}
turn_on_action:
- lambda: id(oled).turn_on();
turn_off_action:
- lambda: id(oled).turn_off();
uart:
- rx_pin: 7
tx_pin: 9
baud_rate: 9600
id: pms_uart
- rx_pin: 16
tx_pin: 18
baud_rate: 9600
id: c02_uart
sensor:
- platform: sht3xd
temperature:
id: temp
name: "Temperature"
humidity:
id: humidity
name: "Humidity"
address: 0x44
- platform: template
id: temp_f
lambda: return id(temp).state * 9/5+32;
- platform: pmsx003
type: PMSX003
uart_id: pms_uart
pm_1_0:
id: pm10
name: "Particulate Matter <1.0Āµm Concentration"
pm_2_5:
id: pm25
name: "Particulate Matter <2.5Āµm Concentration"
pm_10_0:
id: pm100
name: "Particulate Matter <10.0Āµm Concentration"
update_interval: 120s
- platform: senseair
uart_id: c02_uart
co2:
id: co2
name: "CO2 level"
- platform: sgp4x
voc:
name: "VOC Index"
nox:
name: "NOx Index"
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