I got an HTU21D temperature and humidity breakout board from Sparkfun
(https://www.sparkfun.com/products/12064). Since I'm a novice at
electronics I'm unsure if I've made an error in connecting the device or
there is some device driver issue. I connected the breakout to my
beaglebone black as follows:
+ : Pin 3 (VDD)
- : Pin 1 (GND)
DA : Pin 20
CL : Pin 19
The datasheet says 3.8V maximum and since the VDD is 3.3V, I thought no
logic level converter would be necessary. Running i2cdetect doesn't show
anything connected. The output is as follows:
# i2cdetect -r -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- UU UU UU UU -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
I tried to initialize the driver by running:
# echo htu21 0x40 > /sys/class/i2c-adapter/i2c-1/new_device
This is what I see in dmesg:
[215690.914098] i2c i2c-1: new_device: Instantiated device htu21 at 0x40
But there are no directories created under '/sys/bus/i2c/drivers'
corresponding to this driver.
Rushi
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