Nick k5njm

CJK support on Beepy (both display and input)

The Beepy uses a monochrome sharp memory LCD panel which has some caveat. This document includes a way to bring CJK support to Beepy in the framebuffer. The below is based on raspbian on raspberry pi zero, and had ran the Beepy setup script found on https://beepy.sqfmi.com/docs/getting-started.

Install DRM driver for the LCD

We will be using fbterm. Since fbterm supports minimal of 32bpp, we need to install a DRM driver for the sharp memory LCD panel to enable 32bpp mode.

Download the driver made by excel,

$ git clone https://github.com/ardangelo/sharp-drm-driver.git

RP2040 Firmware

Improved power management
Updatable firmware (2023-12-09)
- Use pico-flashloader preload stage (2023-09-04)
- Flash test image hardcoded into firmware (2023-12-03)
- Implement I2C firmware update protocol (2023-12-08)
Shutdown / rewake command (2023-11-30)
Real time clock support
Sticky modifier keys

This flow (and associated circuits/hardware) is designed to allow Node-RED to pass messages via radio waves in the same way as it passes messages via MQTT, using commonly-available, inexpensive handheld radios and the Raspberry Pi. The flow has been tested using Baofeng, Wouxun, and Quansheng handheld ham radios. In short, the goal is to allow packet-like transmissions between Node-RED systems over miles, while keeping the hardware costs down (or free for those hams who have surplus Baofengs hanging around). This could be used for a backup to MQTT when the Wifi is unreliable, or simply as a long-distance and network-agnostic message channel.

Prerequisites: Software

First, we need PulseAudio to make and receive sounds with our USB soundcard:

sudo apt-get install pulseaudio -y

	#!/usr/bin/env -S bash -c "docker run -p 8080:8080 -it --rm \$(docker build --progress plain -f \$0 . 2>&1 \| tee /dev/stderr \| grep -oP 'sha256:[0-9a-f]*')"

	# syntax = docker/dockerfile:1.4.0

	FROM node:20

	WORKDIR /root

	RUN npm install sqlite3

	def parse_dynamo_item(item):
	resp = {}
	if type(item) is str:
	return item
	for key,struct in item.iteritems():
	if type(struct) is str:
	if key == 'I':
	return int(struct)
	else:
	return struct