birv2
Raspberry Pi Certified Educator
Raspberry Pi Certified Educator
Posts: 115
Joined: Sat May 16, 2015 2:07 pm

Defective temp sensor on SenseHAT

Wed Feb 01, 2017 2:38 pm

I have a set of 20 SenseHATs which I bought from Adafruit last school year. I have only just started demoing the temp readings in an attempt to do some IoT stuff. In doing so, I found some HATs were reading wildly differently. Have done reading here and found that there were some issues with some of the HATs.

I posted on the Adafruit support site and they said: "Please check with the RasPi Foundation to see if there are any ID marks on the Sense Hat that would place them in the production lot that had the problem."

I'm not even sure whom that would be, but I am posting this here in hopes that it will get routed to the right person at the Foundation.

FYI -- here is the code I ran, followed by reading from different Pi's:

from sense_hat import SenseHat
import time
import sys



sense= SenseHat()
sense.clear()

temp = sense.get_temperature()
print(temp)

temp_humidity = sense.get_temperature_from_humidity()
print(temp_humidity)

_____________________________________________

Results are as follows, with the first # being the Pi and the 2nd being the temp in C:
1 25.0
7 94.8
8 31.96
12 27.7
18 21.7
20 25.19
15 23.12
6 -148.25
16 22.28
17 24.61
14 21.65
9 22.46
3 134.76
10 -47.23
4 389

All the tests were done in the same room within a 30 minute time frame. I can see some variation, which might be attributable to several factors. Some are obviously way off.

Thanks in advance!
Bob Irving
Porter-Gaud School
Charleston, SC

gsh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 1416
Joined: Sat Sep 10, 2011 11:43 am

Re: Defective temp sensor on SenseHAT

Tue Feb 07, 2017 1:21 pm

Please RMA failing units back to Adafruit

Gordon
--
Gordon Hollingworth PhD
Raspberry Pi - Director of Software Engineering

Return to “Astro Pi”