Let’s deep the topic.
There is probably something that I miss or I’m doing wrong so I would like to make the project work on pi4 and then I’ll think about how to move on pi zero.
The Touch screen uses 26 GPIO Pins with its connector.
To use also RFID Reader I can use Pin from 27 to 40 but I need to exclude 27 and 28.
In a standard condition, without a touch screen, I can connect the RFID reader as per the following picture
Anyway, those pins are taken by the touch screen.
So what I do is this
I use pin 33 to control the module powering, turning it on and off by asking for a logical value of 1 or 0. This works and as per my previous post, the reader can read. IRQ is connected to GND because for now, I want it to a stable condition. Leaving it flying doesn’t assure me about its value.
I'm starting to think that the problem arises from some call that node-red makes when I request the deployment of the flow by adding the rc522 node.
It is as if before loading the required configuration it executed something on the spidev0.1 channel disturbing the graphic part of the touch screen which goes into error (I can't read anywhere) and generates the white screen.
Maybe there is some software module to reconfigure and recompile but I haven't figured out where to put my hands yet.
There is probably something that I miss or I’m doing wrong so I would like to make the project work on pi4 and then I’ll think about how to move on pi zero.
The Touch screen uses 26 GPIO Pins with its connector.
To use also RFID Reader I can use Pin from 27 to 40 but I need to exclude 27 and 28.
- Image may be NSFW.
Clik here to view.
- Image may be NSFW.
Clik here to view.
So what I do is this
- Image may be NSFW.
Clik here to view.
I'm starting to think that the problem arises from some call that node-red makes when I request the deployment of the flow by adding the rc522 node.
It is as if before loading the required configuration it executed something on the spidev0.1 channel disturbing the graphic part of the touch screen which goes into error (I can't read anywhere) and generates the white screen.
Maybe there is some software module to reconfigure and recompile but I haven't figured out where to put my hands yet.
Statistics: Posted by PiscoM — Fri Mar 08, 2024 9:15 am
