A0 always returns 1024

Development
1

Hi everyone,

I just got my Bolt IoT and played a little bit.
Digital IO seems to work fine, but Analog IO always gives 1024 if Sensor is connected or Random Value if no Sensor is connected.

I did as described in QuickStartGuide Project 1 with an LDR, a Resistor and wired like explained in the PDF.

Here my wireing (had no Bolt for Fritzing, so used ESP8266, Yellow is connected to A0 on Bolt)

ldr.jpg435×867 95 KB

Any suggestions?

Kind regards
Manuel Ritter

2

@ritter.net: HI.
There are only 2 possible ways you would get 1024 output

  1. The internal resistance of the LRD is less than 759ohms. This can happen if you have a bright light shining on the LDR.
  2. There is a loose connection in the 330 resistor. It could be that the resister is loose on the A0 pin, or on the GND pin.

I suggest checking the connections again.

1 Like
3

Hi vinayak.joshi,

thanks for your reply.
I don’t think its 1, as I tested with several light levels, from “direct smartphone led” to “covered inside a closed cardboard box”
I will check all connections when I’m back home tonight

Kind Regards
Manuel Ritter

4

Hi @ritter.net,

Can you try reading the value of the LDR via the API in your browser and observing the output.
For E.g. the API call would be something like,

https://cloud.boltiot.com/remote/YOUR_API/analogRead?pin=A0&deviceName=YOUR_DEVICE_NAME

Assuming you have connected the LDR to pin A0.
You should receive an output something like,
{“value”: “79”, “success”: “1”}

5

@ritter.net,
When you are trying the api call that @shoeb.ahmed mentioned, do remember to replace the words ‘YOUR_API’ with the api key that you can find in your dashboard.

6

@vinayak.joshi Thanks for reminding me about that. I had forgotten to mention it.

7

thanks for sharing such a nice post i also wanted to know good to know
with regards
https://kodi.software/

8

Try with a different resistor. It worked for me

1 Like
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