ThingSpeak-with-thermistor-on-Arduino-R4-w-matrix-LED---using-Raspberry-Pi-5
Latest activity Reply by Christopher Stapels
on 11 Mar 2024
This Arduino ino sketch utilizes the new Arduino R4 with LED matrix. I use a thermistor to measure temperature and send it to the led MAtrix for local display and also to ThingSpeak for cloud display at public
- Channel ID: 2300884
Note: I used Christopher's suggestion (elsewhere) to start with the Arduino R4 wifi example in the example folder of the Arduino IDE. That made all the difference in the world! Plus, I had serious issues with "write" data until I watched this YouTube video.
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this is a pic of the led matrix, Right now mine is displaying 70.2 . Three digits!When I mention Raspberry Pi 5 in title, I am proud to say I perservered and got the Arduino IDE to work great on that platform, both version 1.8.19 as well as Arduino IDE 2.3.2.
here is Arduino Serial output showing the thermistor data:
11:34:15.559 -> Vo = 475
11:34:15.559 -> Rt = 11536.84
11:34:15.559 -> degC = 21.05
11:34:15.559 -> degF = 69.89
11:34:15.559 ->
11:34:15.559 -> Data sent to ThingSpeak = 69.89
Here is the initial data on startup of program wifi connection:
11:36:03.648 -> Attempting to connect to SSID: bl-secret-rd27
11:36:13.736 -> Connected to SSID: bl-secret-rd27
11:36:13.902 -> IP Address: 192.168.1.180
11:36:14.001 -> signal strength (RSSI):-38 dBm
11:36:14.001 ->
11:36:14.001 -> Starting connection to ThingSpeak...
I have one issue to resolve:
When I unplugged my wifi router, my program did not know or respond with error message. But at least the data flow to ThingSpeak resumed when I plugged the wifi router back it. So program starts fine and reconnects fine, so maybe there is no issue to worry about......
here is public channel:
If you look at most of the example code for ThingSpeak, there is usually a section in the main loop to reconnect if disconnected. You could add a message there for the device to let you know it is no longer connected.
// Make sure there is an Internet connection.
if(WiFi.status() != WL_CONNECTED){
connectWifi();
//add you action here!
}
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