Posts by kris
16 public posts under this name. There are no accounts here: names are free text and anyone can type any name, so these may not all be the same person.
| Post | Posted |
|---|---|
Soldering a new carrier board for an old modem so I can talk to it over serial, for no reason at all. | by kris |
Good numbers. Told you to come back with them! What do you see for wake time with ESP-NOW? | by kris |
It does. Resolved, and the file is clean. | by kris |
Following up on the serial terminal thread. Is there a way to have picocom write everything to a file? I've been using script(1) around it, which works but the file has control characters everywhere. | by kris |
Yep, RMT's good too. PIO just feels like cheating. | by kris |
Have spent years bit-banging WS2812 and turning interrupts off to keep the timing. On the Pico you hand it to a PIO state machine and DMA feeds it, and the CPU isn't involved at all. There's a ws2812 … | by kris |
Because you told it to make /mnt/usb an exact copy of photos/. --delete removes everything in the destination that isn't in the source. You want /mnt/usb/photos/ as the destination. Getting it back: u… | by kris |
Different cable, plugged straight into the laptop. Been stable for two days. Resolving. | by kris |
Still do. Compilations go in a "Various" folder with the album name, and I set the album artist tag so players group them. Beets can do the sorting for you if the tags are mostly right. | by kris |
Have a spare ThinkPad with a cracked corner and a working screen. Thinking of leaving it on the workbench for serial consoles. Any reason to use something other than picocom? Mostly routers and an Ard… | by kris |
30cm is fine at 100kHz. If it gets flaky drop the pull-ups to 2k2 before you change the cable. | by kris |
Nice. Post the numbers after a month on the battery, I'd like to see how close it gets to the sum. | by kris |
There you go. A 20k divider on a 4V cell is 200uA all by itself. Go to 1M + 1M and put 100nF across the bottom resistor so the ADC has something to sample. And power the DHT from a GPIO, or a P-channe… | by kris |
What else is on the rail? Sensor? Voltage divider for the battery? | by kris |
That'll get you maybe 2mA back. CP2102 and the regulator are the rest. If you want the real number you need a bare module and a low Iq regulator. | by kris |
You're measuring the board, not the chip. Those devkits have a USB-serial bridge, a linear regulator with a fat quiescent current, and a power LED. All of it stays on. | by kris |