Salvaged Humidity Sensor

[bigone5500]

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?

 

[davenn]

OK the SDA and SCL are part of the I2C bus system

here's a link to a tutorial on the subject
http://www.robot-electronics.co.uk/i2c-tutorial

there are many more links on google


Dave

 

[jayanthd]

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.

 

[bigone5500]

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.

The only thing close to a datasheet for this is here. I can't get the pdf as it is embedded in a flash of some sort.

 

[bigone5500]

OK the SDA and SCL are part of the I2C bus system

here's a link to a tutorial on the subject
http://www.robot-electronics.co.uk/i2c-tutorial

there are many more links on google


Dave

Thanks Dave. I am going to play around with it and see what it will do. I am a bit leary of it being accurate without knowing more about it.

 

[Gavin Groce]

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]

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]

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.