Recent posts to MCP3008 only gives 255 or 0https://forge.codesys.com/forge/talk/Runtime/thread/9eda65c2dd/2020-02-27T16:12:09.271000ZRecent posts to MCP3008 only gives 255 or 0MCP3008 only gives 255 or 02020-02-27T16:12:09.271000Z2020-02-27T16:12:09.271000Zeamonnhttps://forge.codesys.com/u/eamonn/https://forge.codesys.com93d29555113ddc1ee4abe8267b8fbb6abb24e8b6<div class="markdown_content"><p>Thanks for the reply.<br/>
That seems to have fixed the problem.<br/>
I now get a range of readings. similar to what I expected.</p>
<p>Thank you.</p></div>MCP3008 only gives 255 or 02020-02-27T16:12:08.445000Z2020-02-27T16:12:08.445000Zeschwellingerhttps://forge.codesys.com/u/eschwellinger/https://forge.codesys.com87128b822637e7c9c991e87fafef4a828f4ba919<div class="markdown_content"><p>Hi,<br/>
if you are working with Rasbian Stretch from 11-29-2017 Version (current Version)<br/>
there seems a Problem with the maxSPI Speed.<br/>
You can reduce here the SPImax Speed, then it should work. (sure depends on your used Versions of Rasbian)</p>
<p><a class="" href="https://www.raspberrypi.org/forums/viewtopic.php?f=44&t=207412" rel="nofollow">https://www.raspberrypi.org/forums/view ... 4&t=207412</a></p>
<p>BR<br/>
Edwin</p>
<p><img alt="IMG: SPI_SPeed.jpg" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=3548"/></p></div>MCP3008 only gives 255 or 02020-02-27T16:12:06.165000Z2020-02-27T16:12:06.165000Zeamonnhttps://forge.codesys.com/u/eamonn/https://forge.codesys.comb343a8abd70d68e271ae7173c06f1dc8ba11917e<div class="markdown_content"><p>I set up the mcp3008 the same as the picture. I am using different sensors though.<br/>
I tried testing it with a potentiometer and that's how I found out it gives 255 if the channel input is 1 volt higher than Vref and 0 if its less.<br/>
I am using a raspberry pi 3 model B.</p>
<p><img alt="IMG: Untitled.png" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=3547"/></p></div>MCP3008 only gives 255 or 02020-02-27T16:12:05.364000Z2020-02-27T16:12:05.364000ZIngohttps://forge.codesys.com/u/ingo/https://forge.codesys.com0b3fd527ed03f9c79416f1d9f4212223fbb497da<div class="markdown_content"><p>Can you post your setup?<br/>
A photo or a sketch (e.g. with "Fritzing").</p>
<p>Gesendet von meinem LG-H870 mit Tapatalk</p></div>MCP3008 only gives 255 or 02020-02-27T16:12:04.560000Z2020-02-27T16:12:04.560000Zeamonnhttps://forge.codesys.com/u/eamonn/https://forge.codesys.com14c6f224900e45096ec6107f1f0fcdd78152e095<div class="markdown_content"><p>I am trying to measure temperature using a MCP3008 to convert the values. The only values I get from it are 0 or 255.<br/>
I check the wiring a few times so I doubt that's the problem. I have setup the SPI master and MCP3008.<br/>
It only gives 255 when the input to channel 0 is 1V higher than Vref.</p></div>