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Salvaged Humidity Sensor

bigone5500

Apr 9, 2014
712
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Apr 9, 2014
Messages
712
I salvaged a humidity sensor from an old HP laser printer. The number on it is RHI-110D-CA. It has 4 wires. Pins 1 through 4 are Vin, SDA, GND, and SCL respectively. The chip is what I think I have found to be an equivalent of this.

The power source is 3 to 5.5vdc so I am sure I can use it with an arduino. However, I am unsure how to do this. Do specific parts need their own libraries to operate? Can they be simply connected and load a generic sketch and library?

20150907_153929.jpg 20150907_154214-1.jpg
 

jayanthd

Jul 4, 2015
43
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Jul 4, 2015
Messages
43
If you post the datasheet of the device RHI-110D-CA then I might be able to provide you a an Arduino code to read humidity.
 

Gavin Groce

Apr 17, 2017
1
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Apr 17, 2017
Messages
1
Ok this is an old post but I have access to a bunch of these, so here is the data.

Pinout
1 power 3v to 5.5v
2 temp humidity in serial dat a
3 GND
4 Serial Clock

Humidity Hex Table
10% 064 20% 0c8 30% 12c 40% 190 50%1f4 60% 258 70% 2c 80% 320 90% 384

Temprature Hex Table
5c 3c 15c 50 25c 64 35c 78 45c 8c 55c a0

I am trying to use this wit a raspberry pi and mqtt.

Hope it helps.
 

silvestro

Aug 24, 2017
1
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Aug 24, 2017
Messages
1
Hi Gavin,
did you make any progress with using the sensor and raspberry?

I have a few of these and would like to get environmental data using arduino or ESP8266 ...

Thank you,
s.
 

bigone5500

Apr 9, 2014
712
Joined
Apr 9, 2014
Messages
712
I have a new humidity sensor which is different than the original one in this thread. I need to figure out how to use it with arduino. Anyone ever used one of these: HSU-07A. It came from a laser printer. I have a working thermometer and want a humidity readout along with the temp.

I have read on a datasheet that you should have a 47uF cap and 100k resistor in parallel on the Vout line. Then I read on another forum that someone said to not use them. This board uses a chip with the information: 2903 H193A.

20170905_210741.jpg
 
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