Raspberry Pi Forums

Idahowalker

Hi, I am rebuilding an old landrover defender 90 it has no onboard computers or digital sensors. I am planning to use my raspberry pi as a dashboard but I didn't really know how to go about making one or what software/ hardware I would need. I am hoping someone would be able to give me some pointer...

Idahowalker

Python multiprocessing is now very easy to use. I used that in a practical way to ping the local subnet to discover all hosts: https://github.com/mikerr/Pingu Relevent part code is: def ping: .... hosts = [] for i in range(255): hosts.append("192.168.0." + str(i)) pool = ThreadPool(100) results = p...

Idahowalker

Something along the lines of a CD4066, might even use two or three to make a switch matrix controlled by the RPi.

Idahowalker

A wiring block like this would work well:

https://smile.amazon.com/Position-Termi ... ay&sr=8-17, look neat and would be a good option.

Idahowalker

Do you have a schematic?

Have you bought several proto boards and tried different wiring connection schemes?

Can you solder and do crimp connections?

Are your wires solid or stranded, those connectors only work with solid wire?

Idahowalker

Is the LAN cable shielded? Try grounding the shield at only the Pi end to turn the shield into a cap that can absorb spurious signals. If the LAN cable is not shielded then try wrapping a small wire around the outside of the LAN cable. You would wind the wire in tight coils at each end and towards t...

Idahowalker

Entering "python multiprocessing" will bring you closer to running two things, on the Pi at the 'same' time. The Python IDLE will NOT do multiprocessing, as of the last time I tried. Use Thonny for multiprocessing. You'll also need to use queues if passing info from one processor to the next. Thread...

Idahowalker

If you could, use 2 ultrasonic sensors and compare readings.

Idahowalker

Serial.print(analogRead(A1));
Serial.print ( ",");
Serial.print(analogRead(A2));
Serial.print ( ",");
Serial.print(analogRead(A3));
Serial.print ( ",");
Serial.println(analogRead(A4));

Idahowalker

A TFMini

Idahowalker

I use a TFMini to scan an area, for another purpose, to obtain a rather good image of an area. I make 12 scans per degree and scan +/- 5 degrees off 90, the scan is done in both directions, takes .072 seconds per scan, I disregard any measurement over 600cm, and I am able to discern, on screen, a 2 ...

Idahowalker

Those relays will require a 5 volt input on the VOC pin, a circuit common input on the GND pin and will take a 3.3 v input, low signal, to enable on the INX pins. The low in will cause the LEDS to illuminate and a click will be heard as the relays energize. Those relays have optically isolated input...

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...

Search found 445 matches

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Re: running two functions simultaneously

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Re: Best way to splice multiple wires/components into a single circuit

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