I’ve been looking for a way of storing Voltage and Climate information on the internet and I have modified your example Thingspeak code which works fine (thank you)  and has been uploading data reliably for 5 days.

I wanted to be sure the system is reliable and I am not sure if it would be best to put the ESP into sleep mode and wake up at regular intervals or is there a ‘watchdog’ routine I could use to ensure the device is running and traps disconnection or upload failures.  Could I use the error code request.txt to trigger something ?

Thanks Peter

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# modified project details from https://RandomNerdTutorials.com
from time import sleep
import network
import urequests
import urandom
def randint(min, max):
span = max - min + 1
div = 0x3fffffff // span
offset = urandom.getrandbits(30) // div
val = min + offset
return val
import esp
esp.osdebug(None)
import gc
gc.collect()
#ssid = 'REPLACE_WITH_YOUR_SSID'
#password = 'REPLACE_WITH_YOUR_PASSWORD'
api_key = 'xxxxx'
station = network.WLAN(network.STA_IF)
station.active(True)
station.connect(ssid, password)
while station.isconnected() == False:
pass
print('Connection successful')
print(station.ifconfig())
temp = '12'
hum = '70'
volt = 28
while True:

volt = randint(18,30)
volt = str(volt)
temp = randint(15,32)
temp = str(temp)
hum = randint(45,65)
hum = str(hum)

sensor_readings = {'field1':temp, 'field2':hum, 'field3':volt}
print(sensor_readings)

request_headers = {'Content-Type': 'application/json'}
request = urequests.post('http://api.thingspeak.com/update?api_key=' + api_key,
json=sensor_readings,headers=request_headers)
print(request.text)
request.close()

sleep(40)
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PS, I’ve just noticed your editor removes tabs from MicroPython code