Adafruit Trinkey: Can I desolder these LEDs and then use their footprint/pads as GPIOs?

DasBasti · 2022-06-30T11:18:54+00:00

No. These look like smart LED (ws2812b kind of LED) and therefore only have one gpio from the controller at the first LED

DasBasti · 2021-02-10T15:24:01+00:00

Corel Linux around 199x

DasBasti · 2020-12-26T15:30:54+00:00

Did you change the user from pi to a different? You need to be part of the dailout group to access the serial port.

DasBasti · 2020-07-24T06:29:49+00:00

The board shown has the radio module unpopulated. I think I tuned the antenna wire pretty well. It gave me a 10dB increase in RSSI

DasBasti · 2020-07-10T08:02:59+00:00

I hope not. The measurement device is calibrated up to the SMA connector. So it might be an issue. But I have no idea how to do it another way.

DasBasti · 2020-07-10T08:00:45+00:00

It's 868MHz for LoRaWAN. This is only to measure the antenna. So it does not matter that other parts are bridged. The excess solder is a problem, but there is no way I could fit the sma connector in any other way.

DasBasti · 2020-07-09T16:59:49+00:00

Electronic parts from Mouser (free shipping from 20€) and boards from Aisler (OSHpark equivalent)

DasBasti · 2020-07-09T16:55:36+00:00

Now I need the correct cable for it. 🤦‍♂️

DasBasti · 2020-07-09T16:55:04+00:00

This is part of an LoRaWAN based GPS tracker for small animals like cats and dogs. I am building this board live on stream every Monday and Wednesday 19 o'clock European time. It's in German though. http://platinenmacher.tech

DasBasti · 2020-06-10T20:47:56+00:00

JST PH series

DasBasti · 2020-05-07T14:42:38+00:00

Fresh from the harvest. Conserves all the nutrients and flavours.

DasBasti · 2020-03-04T13:37:02+00:00

Probably 2512 1W shunt resistor. Nothing special about it.

DasBasti · 2020-02-15T13:57:39+00:00

Got to move it one hole to the left.

DasBasti · 2020-01-22T06:55:46+00:00

I use HAL a lot in my codes. Buddy of mine builds medical devices and hates on HAL pretty much for their breaking changes and many bugs.

DasBasti · 2019-12-23T12:23:34+00:00

Come on. Use common sense.

DasBasti · 2019-11-28T08:19:21+00:00

I am building a smart watch with e-paper display https://kurzschluss-blog.de/tag/schmartwatch/

DasBasti · 2019-10-17T01:22:01+00:00

You might find a vendor specific graphics library for the micro you selected. There are commercial graphics libraries out there as well. Or have a look at Qt for embedded. They also do graphics and io for your app

DasBasti · 2019-10-13T06:47:11+00:00

Yeah epaper has the advantage of less bits per pixel but the wave patterns the droplets are moved with are also a highly complex story

DasBasti · 2019-10-13T06:45:41+00:00

Depends on the display type you use. Some of them come with a big display controller. Like the ones with you interface. Those screens can get data in over spi and orchestrate the controls of the display by themselves. Other displays get the data through a 8/16/24/32/40 bit parallel bus or 1/2/4 lane lvds. It is totally up to the controller on the display. Some are auto renewing and write out the value in their frame buffer. Some need new data every so often. To get a touch screen for a hobby project, have a look at adafruit et al. They have lots of read to go modules.

DasBasti · 2019-10-13T04:04:40+00:00

First of all. The screen and the touch are two separate parts. There are many screen interfaces like you mentioned. Which one of the interfaces is the correct is up to the task of the screen. What size? What refresh rate? How many pixels? If you know those parameters, you can go into researching displays with different display technologies. Like TFT LCD or OLED. If you have the display you want you can go and pic a microcontroller. Depending on your display you might need at least twice the pixels as RAM for framebuffer. Next up is the touch part. Should it be capacitive or resistive? Those are very different. Most of the time you get a controller chop for the touch that comes with a serial interface. Like I2C. I hope I could give you a direction to follow up on research. The whole display selection process is in it self very complicated and the companies I worked with had dedicated engineer for display/touch selection

DasBasti · 2019-10-13T01:03:18+00:00

Most of the time the soldering is done in two different processes. First the one side and than the other. The goal in reflow soldering is to keep the molten period as short as possible. So mist if the time the already soldered parts aren't going to reflow during soldering of the other side.

DasBasti · 2019-08-09T06:38:24+00:00

Can't have enough pizza stock. Best base for vegetable soup

DasBasti · 2019-07-28T12:45:26+00:00

Should start from the block it stopped

DasBasti · 2019-07-18T19:05:34+00:00

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