I messed up and bought a pressure sensor for my nitrous bottle. What I should have done is bought a whole gauge with sensor. I'm feeding the 0-5v signal from the sensor into my Holley HP to control my bottle heater. The problem is I can't view my bottle pressure from the drivers seat without having a laptop hooked up. I would like a simple 4 digit display that I could mount in the dash and program(0.5v = 0psi, 4.5v = 1500psi) Is there anything out there? I bought a Raspberry Pi Pico and display with plans of trying to make something but my Python programming skills are limited as well as time. Anybody have another idea?
Load micropython into that Pico and it's a fairly straightforward bit of programming - read an analog voltage input, turn it into a number, display. It's fairly easy to find code examples: reading an analog voltage and controlling a display. Keep in mind you will need to drop your 0-5v signal down to 0-3.3, which is just a matter of a couple of resistors.
If you don't have the time for that, just get a digital voltmeter and learn to think in volts instead of psi.
https://www.adafruit.com/product/575
Keith Tanner said:
Load CircuitPython into that Pico and it's a fairly straightforward bit of programming. If you don't have the time for that, just get a digital voltmeter and learn to think in volts instead of psi.
https://www.adafruit.com/product/575
or an analog 0 to 6 volt gauge and relabel it...
In reply to stafford1500 :
Well, the request was for digital :) But analog would be a lot easier to quickly check. I don't know what the in-car environment is like, if precision is more important than a trend.
In reply to Keith Tanner :
I think it is MicroPython. Will that work? I feel like programming the input will be pretty straightforward but I don't have a clue what to do with the display.
I edited my comment to make it a little more generic. Micropython will work fine, here's your display example: https://www.tomshardware.com/how-to/raspberry-pi-pico-7-segment-display
Thanks Keith. I'll try to spend some time on this and get it figured out. Then I need to reprint my dash so there is somewhere to mount the display. Ideally it will be mounted right in the middle above the buttons.
I just reread your edited comment. Doesn't the Pico have a 5v input?
In reply to Patientzero :
5v for power, but signal inputs cannot exceed 3.3v.
