#Electronics
16 posts tagged “Electronics”
Next Project: ESP32-S3 and a 4.2 Inch E-Ink Display
After designing a case for my ESP32 WiFi scanner I’ve picked up some new parts to play with: a WeAct Studio ESP32-S3-N16R8 dev board — 16MB of flash and 8MB of PSRAM, dual USB-C, RGB status LED, sat in a little printed case I already had lying around — paired with a WeAct Studio 4.2 inch e-paper module, 400x300 resolution over a simple SPI header (GND, SDA, SCL, CS, D/C, RES, BUSY, VCC).
Designing and Printing a Case for My ESP32 WiFi Scanner
After designing my first shelf in TinkerCAD, I wanted a project that actually needed a proper enclosure rather than a mounting bracket. I’d been building a small self-contained WiFi scanner around this cheap ESP32 dev board — an ESP32 module with a built-in 1.14 inch LCD — paired with a small rechargeable battery, and it had been living on my desk as a loose tangle of board, wires and cells. Time to give it a case.
TFT Display ST7735 MicroPython
I got a cheap SPI TFT ST7735 Display module with SD Card reader off ebay, it had an unusual number of pins on the back.
It took a while searching about on the internet and some head scratching to find a library and work out what connected to what on the Pico.
This is what I found, and worked out.
| TFT Board | Raspberry Pi Pin |
|---|---|
| LED | 3v3(Out) |
| SCK | GP10 |
| SDA | GP11 |
| AO/DC | GP16 |
| Reset | GP17 |
| CS | GP18 |
| GND | GND |
| VCC | VBUS 5V |
Using that information I was able to put together this library based on a few others I found and a few test programs.
Small LED Matrix Numbers
Something I did a few (8) years ago on the Arduino to display two-digit numbers on a 8x8 LED matrix, this is an update to do the same in Micropthon.
Numbers have been defined to 3x5 pixels, so for a two-digit number it fits into 8x5 LED grid with spacing, saving some LED Matrix space.
The code for this can be found here numbers.py
DHT11 Sensor in Micropython
Just a short bit of code to test a DHT11 temperature and humidity sensor module.
This version has just three pins VCC, GND and data, so easy to connect and use with the DHT library.
Raspberry Pi Pico W LED Matrix
Found a LED Matrix with a Max7219 in my parts bin (box of random electronics in the garage) so looked into getting it working with the Pico and MicroPython.
This is an example why I love open source. The original library I found was functional but sparse, last committed to 4 years ago. There were a few forks, most not much activity. One had been active recently and had some major improvements in functionality so switched over to that fork. https://github.com/enchant97/micropython-max7219
Raspberry Pi Pico W Mandelbrot Set
Stumbled across a Python script to run a Mandelbrot set in ASCII in Python so I thought I would see how it ran on the RaspberryPi Pico.
After tweaking it slightly from the source it ended up like this mandelbrot.py
This results in the following;
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.....,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---------------::::;;;;;ii+hM@ $hii;;:::::::------,,,,,,,,,,,............
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...........,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,------------::::;;+# hiiii :---------,,,,,,,,,.......................
.............,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----------:::;ih$+;;::::-------,,,,,,,,,..........................
...............,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,---------:i;;::::-------,,,,,,,,,.............................
.................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,----------,,,,,,,,,,,,.................................
.....................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,......................................
..........................,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,.............................................
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.....................................................................................................I amended the code to update the OLED I was using in the temperature sensor tests mand_oled.
Raspberry Pi Pico W Temperature
Have been tinkering with temperature measurement using the Raspberry Pi Pico.
First with the internal temperature sensor and then using a TMP36 temperature sensor externally.
I wrote two classes to access these and return the reading.
Here is an example using the two sensors together temps.py
You will need to upload the two classes to the Pico first in a library sub-directory.
Here is how you would wire it up on a breadboard tmp36.fzz
Rasberry Pi Pico W OLED
Some components arrived from AliExpress recently so been able to play with an I2C OLED display with my Pico W.
Hello World Test
Code of this is here https://github.com/alastairhm/pico_w/blob/main/i2c_scan.py
And also used here to display the IP address after connected to the wifi https://github.com/alastairhm/pico_w/blob/main/wifi_oled.py
Next thing I’ve been playing with is internal and external temperature sensors, I will post about that soon.
Raspberry Pi Pico W
Just before Christmas I got a Raspberry Pi Pico W to have a play with.
Looking forward to using MicroPython to do some LED flashing and other things.
Started a repo on Github for it Pico W Repo
Day 169 Light holiday reading
Note: the only link in this post is now broken. Left as originally published.
New Arduino book :) http://flic.kr/p/fQ2fRu, September 12, 2013 at 04:11PM
123D Circuits
Dusting off the iron
My first attempt at soldering after around eight years away from the soldering iron.
Counting up to 1023
Decided in the end to wire up all 10 LEDS in the LED bar graph.
Using the sketch below get the results shown in the video.
read more
Using the sketch below get the results shown in the video.
int numLed = 10; int ledpins[] = { 13,12,11,10,9,8,7,6,5,4}; int mask[] = { 1,2,4,8,16,32,64,128,256,512}; int counter = 0;void setup() {
// initialize the digital pin as an output. for (int i=0;i<numLed;i++){ pinMode(ledpins[i], OUTPUT); digitalWrite(ledpins[i], HIGH); delay(250); } }
Arduino Binary second counter
Next step with my Arduino is to set up a binary second counter.
Basic using the LED Bar Graph or six single LEDs to count seconds in binary
read more
Basic using the LED Bar Graph or six single LEDs to count seconds in binary
/* Binary Second Counter Created Alastair Montgomery 22/11/2012 */int ledPins[] = { 7,8,9,10,11,12}; int mask[] = { 1,2,4,8,16,32}; int ledCount = 6;
void setup() { for (int thisPin =0; thisPin < ledCount; thisPin++) { pinMode(ledPins[thisPin], OUTPUT); } }
Sanity Checking my new Arduino Uno Board
Quick sanity check of my new Arduino board using a LED Bar Graph.
Here is the sketch I will be using.
int led1 = 8; int led2 = 9; int counter = 0;void setup() {
// initialize the digital pin as an output. pinMode(led1, OUTPUT); pinMode(led2, OUTPUT);
}void loop() {
if (counter & 1) { digitalWrite(led1, HIGH); } else { digitalWrite(led1, LOW); }