As I randomly slid cards in and out, trying various combinations, I suddenly noticed something. The random characters on screen didn't look so random! More in-and-out card-swapping, trying them in different slots, and power-cycles... hey, those aren't...
I got this idea based off of a research paper a friend showed me and decided to go full prototyping mode with it!So let's say we have two tapes right, E is our tape with magnets on it, which is slightly longer than D (which has hall sensors). They are...
The current version of the OSPi hardware can be found at https://github.com/OpenSprinkler/OpenSprinkler-Hardware/tree/master/OSPi/1.52. I don't need the analog inputs. So my simulation circuit is just a 74HC595 connected to the raspi as in the schematic...
Yes.As I use Debian bookworm with kernel 6.1 I can control the GPIOs without using WiringPi (which as I understand is used by OSPi). I wrote a short python script to blink LEDs on GPIO 16 and 20. These GPIOs are not used by OSPi by default. As I understand...
There was no big surprise. I wrote another short test program (mqtt-test.py) to subscribe to one of my moisture sensors. They simply provide an unsigned integer value. I merely have to get this value and define a threshold below which the soil is sufficiently...
Since I now can provide moisture sensor values via MQTT to OSPi, it's time to order a board and the other necessary hardware. As I understand, there are plans to integrate MQTT subscriptions into the OpenSprinkler firmware. I hope that this will...
Initially, I roughly design the device to meet the following points: Slim and smallCellular connectivityGNSS -based location trackingLow-costBattery-powered and Rechargeable Working on the schematics, I was able to achieves those points and choses...
So this project is much simpler than the previous ML Hat Cam where it was this massive thing with steppers. The zoomable voice command feature was really neat and it had a control loop to autofocus using laplace variance.(Nickelback: look at this piece...
In 5 daysThis is a distraction from writing the Pelicam software but days off and nice weather, have to flyI'm going to at the very least build a crude 1 day thing that functionsIt is pretty much just a battery-powered rpi cam... but it will be attached...
I've started by laying out the five boards in Eagle 9.52. Boards are now being ordered through JLC. All parts have been ordered through Mouser and Digikey - however sourcing a small meter and solar panel that will match have been a bit of...
PCBs came in! Thanks JLCPCB!!Soldered up the boards - Kino in the Design Lab Laser cut a cool outline in plywood that I'm using for the base for testing.Boards were soldered and mounted. There were some clearance issues with the meter...
Well, initial testing was more difficult than expected - took about five hours just to get a couple of basic circuits working. Made a number of incorrect assumptions / mistakes including:Assuming it might be differences between components (germanium...
As the title says, this is a preliminary test of the first version of the multimeter. Before the test, I basically calibrated it using my Fluke 101 as a reference. The results of the test are as follows: 2.5V Error: 0.569, Coeff of Var: 0.0102 5V Error:...
To make the display work on revision 1, I bypassed the display driver and wired the pico IO pins strait to the segment LEDs. It is a little faint, as the display driver circuit worked completely differently, but it works to test the display.