1 Arduino + 3 or 4 LM35s? Answered
I am a total beginner, having logged about one hour here (the last hour).
Does this sound OK for a first Arduino project?
I want to sample and log the temperature outside at the surface and at depth for a total of 4 readings to a depth of around 50cm (20"). The reason is to consider if I should provide my daughter's pet rabbits with an underground burrow as relief against the next heat wave. It seems a nicer option than running a swamp cooler all day. Though I suppose I could use an Arduino + LM35 to turn on and off the swamp cooler :)
It looks like I can do it with 4 x LM35s, an Arduino One, some sort of data storage, a 9v battery and a bread board.
Any recommendations for if I should use WiFi or an SD card for storage? My guess is the SD card is simpler to programme and maybe less of a battery drain.
It seems I just need to hook up the data out of the LM35s to the analogue ports, then loop over the inputs and write the outputs to a file somewhere. And calibration too.
Any pointers on how to turn the LM35s into probes that can be buried in the ground? I was thinking I could bind all the probes onto a dowel, dig a hole and bury it.
How to extend the LM35 pin outs?
Thanks in advance for any suggestions.