<![CDATA[LDR sensor with Lopy]]>Hello everyone. I am trying to use LDR sensor with Lopy but i am facing some issues. First of all when i am using the sensor with my arduino a 10kΩ resistor and power supply 3.3V, it works well.
When i use it with my Lopy it always send me back the value 4095. (supply=3.3V, Pin=P16)
I tried if i am using wrong pin but when i use the tmp36 sensor it works well.
Any thoughts?

]]>https://forum.pycom.io/topic/1445/ldr-sensor-with-lopyRSS for NodeSat, 05 Sep 2026 11:02:09 GMTMon, 03 Jul 2017 15:14:09 GMT60<![CDATA[Reply to LDR sensor with Lopy on Mon, 03 Jul 2017 15:14:09 GMT]]>Hello everyone. I am trying to use LDR sensor with Lopy but i am facing some issues. First of all when i am using the sensor with my arduino a 10kΩ resistor and power supply 3.3V, it works well.
When i use it with my Lopy it always send me back the value 4095. (supply=3.3V, Pin=P16)
I tried if i am using wrong pin but when i use the tmp36 sensor it works well.
Any thoughts?

]]>https://forum.pycom.io/post/9070https://forum.pycom.io/post/9070Mon, 03 Jul 2017 15:14:09 GMT<![CDATA[Reply to LDR sensor with Lopy on Mon, 03 Jul 2017 15:20:24 GMT]]>@kots
Look at attn and bits
https://docs.pycom.io/pycom_esp32/library/machine.ADC.html#machine.adc.channel

]]>https://forum.pycom.io/post/9071https://forum.pycom.io/post/9071Mon, 03 Jul 2017 15:20:24 GMT<![CDATA[Reply to LDR sensor with Lopy on Mon, 03 Jul 2017 16:21:25 GMT]]>@kots To extend the hint of @livius a little bit: for a 3.3v range you must use ADC.ATTN_11DB.

]]>https://forum.pycom.io/post/9080https://forum.pycom.io/post/9080Mon, 03 Jul 2017 16:21:25 GMT<![CDATA[Reply to LDR sensor with Lopy on Tue, 04 Jul 2017 11:25:55 GMT]]>Thank you both for your answers! Finnaly with ADC.ATTN_11DB it works!

]]>https://forum.pycom.io/post/9104https://forum.pycom.io/post/9104Tue, 04 Jul 2017 11:25:55 GMT