Raspberry Pi Forums

Idahowalker

class EvenOnly(list): def append(self, integer): if not isinstance(integer, int): raise TypeError("Only integers can be added") if integer % 2: raise ValueError("Only even numbers can be added") super().append(integer) e = EvenOnly() e.append(2) I'm trying to understand this code and what I don't u...

Idahowalker

I'd use the heatsinks. For the fan, find the fan location on the underside of the case top. Put a dab of hot glue at each spot the fan will mount to, put the fan on top of the cooled hot glue and then hot glue the fan in place. The layer of hot glue will give a vibration damper. I run my RPi at 70% ...

Idahowalker

First off thank you to Imperf3kt. I am here to learn what i did wrong or how i screwed something up not where i should spend my money so if you have advice i will always listen, it was helpful. Next another thanks to Ernst and Idahowalker, i have never heard that about breadboards before and it ult...

Idahowalker

gmail accounts are free. I made an account just for my RPi. All the mail received by that account is just for the RPi. After making the account, send an email from that account to your main account and reply. Seems gmail accounts like a 2 way communication. Yeah, that's what I did as well. Did you ...

Idahowalker

A + on the bme280 SPI connected sensors. Mine has been running in a project for 8+ months. My program, on an ESP32, does a read of the bme280 every 1 second.

Idahowalker

gmail accounts are free. I made an account just for my RPi. All the mail received by that account is just for the RPi. After making the account, send an email from that account to your main account and reply. Seems gmail accounts like a 2 way communication.

Idahowalker

I'm using noobs downloaded about a month ago and just updated and upgraded last night, and I havnt botherd to get an official power supply as yet mostly becouse I have a 6 inch power cord and a dc power supply running to it through a breadboard, if 3 amps over that short a distance wont give me suf...

Idahowalker

By using a full metal gear servo you can get increased torque capacity. Making the servo quiet. How are you powering the servo? I prefer to power the servo with its own supply. Say I have a 9V supply. The uController needs some voltage so I build a 5V power supply for the uController. The servo I us...

Idahowalker

When I tried to use the RPi to interact with an ESP32, I found that, after a while, trying to figure out why it seemed to work but did not work, was that the ESP32 bin files were complied to use a Intel to ESP32 processor bin file. ESPRESSIF does not support the RPi Processor as, as was told by ESPR...

Idahowalker

Take the threading class it has several subclasses; such as thread, Queue, and a few others. If the threading class was imported all the subclasses are loaded but you may only want to use one of the subclasses, can shave off a bit of ram, or you want to use your own name to reference a sub class. So...

Idahowalker

An item like the SR04 has a 15 degree cone of emission. A SR04 does not give accurate distance readings whiles the SR04 is moving. Thus, the SR04 will have to ping, move, stop, ping... The SR04 is a noisy device but with about 30.00USD bucks of modifications you can get 2 to give stable and accurate...

Idahowalker

If you want your program to do 2 things at the same time you may consider multiprocessing on the RPi as one option. You could, also, consider using several inexpensive STM32 Blue pills and assign one blue pill to each channel of the ADC and then have each STM32 report its findings to the RPi. This s...

Idahowalker

I ran a RPi to Arduino Due serial communication at 230400 without issues. I did not use any hardware flow control. I used software flow control. I used "<" to start a message and ">" to end a message sentence for each direction. I'd ignore bytes till the data stream hit a ">" and keep collecting dat...

Idahowalker

Got an Ohm meter? If so what is the resistance reading between the case and the RPi common, GND? Ohm with and without cables connected. Connect one cable at a time and ohm. If you get less then Infinity that's a problem. When you take the Ohm measurements do not touch the case or the ohm meter leads...

Idahowalker

Using your favorite search engine look up 'GPIO callbacks" have the callbacks set a global and have your loop check the status of the global is one way to do this task.

Idahowalker

When I send floats to a Arduino Uno, Mega, Due, STM32, and ESP32 using a RPi serial port I sent the data as bytes by using sSend = "blah blah blah 1234.567" sSend = sSend.encode('utf-8') Perhaps that will work in your situation? Also, sSend = b("blah blah blah 1234.5678") works as well Thanks For t...

Idahowalker

I have a MPU9250 that comes with a magnetometer but your most likely looking for a 3 axis Fluxgate magnetometer. Thanks! Can you explain in layman's terms how a 3-axis fluxgate magnetometer is different from what the Sense Hat is equipped with? Sensitivity. The least sensitive device would be a hal...

Idahowalker

I have a MPU9250 that comes with a magnetometer but your most likely looking for a 3 axis Fluxgate magnetometer.

Idahowalker

When I send floats to a Arduino Uno, Mega, Due, STM32, and ESP32 using a RPi serial port I sent the data as bytes by using

sSend = "blah blah blah 1234.567"
sSend = sSend.encode('utf-8')

Perhaps that will work in your situation?

Also, sSend = b("blah blah blah 1234.5678") works as well

Idahowalker

Have you tried a loop back test? With a loopback test you can see if the RPi is set up properly. Entering the words 'raspberry pi serial loopback' into your favorite search engine will give you a plethora of options for a loop back test. Once you have completed a loopback test you can move outside o...

Idahowalker

My first question is where is the RPi in this scheme? Next, I have a GPS unit I built around a ESP32 that has a temperature / barometer / blah / blah sensor. I soldered the sensor, in a box, as far away from the ESP32 as I could get it and I put a few vent holes in the box for ventilation. I then ra...

Idahowalker

vajra11 wrote: ↑
Sat Dec 29, 2018 3:42 pm

Idahowalker wrote: ↑
Sat Dec 29, 2018 1:40 pm

You created a global variable but you did not declare count in the local functions as global.
I declared global but still giving error perhaps I am making a mistake

Look more closely at the code of my initial response.

Idahowalker

I seen #!/usr/bin/env python from tkinter import * from time import sleep import RPi.GPIO as GPIO import time import datetime GPIO.setmode(GPIO.BCM) INPUT_PIN = 21 GPIO.setup(INPUT_PIN, GPIO.IN) count = 0 def my_callback(channel1): global count ################################################# <<< ...

Idahowalker

What are you expecting the display to show?

What is the code you are using to send stuff to the display?

Idahowalker

Should one go for the latest and greatest, as a general rule, if one could? Getting into pi for the first time, coming from programming background. In the world of software the latest version is best waited out for a bit. Is the same apply here? Or one should buy the latest? Programmer. Buy the bes...

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