A short update about the progress with the sensor panel and photos of the final input panel board. I assembled the new boards and are testing the sensors. As soon as all tests are done, and I am happy with the results and the board’s design, I will write the next part. These are 940nm…
While passive cooling options are often good enough to avoid overheating and thermal throttling–and I do love a ridiculously oversized heat sink–at some point you’ll need to think about using a cooling fan. The problem is that the Raspberry Pi’s GPIO pins don’t supply enough power to get one going.
One alternative is to hook the fan up to a 5V and ground pin, and just have it run continuously. However, this seems slightly wasteful power-wise, and potentially quite annoying. As outlined previously, you can also use a transistor and temperature-reactive Bash script to turn a fan on and off via the processor’s temperature. Things have changed since mid-2020, however, and Raspberry Pi OS now has this functionality built-in. Making things even more convenient, if you’re using a fan with a PWM input, you don’t actually need to add an extra transistor!
Swap out your LDO for a switcher today, with these designs for a modern take on the TO-220 mounted LM1117 and 78xx series LDO regulators! This project is my take on a quick and easy replacement for the 3-pin LDO. The aim is to replace TO-220 linear regulators with a switching converter, in pursuit of higher efficiencies and current capacity.
Using a Recom RPX series DC-DC module for its small size and incorporating SMD feedback resistors and bulk capacitance on board allows for a drop-in replacement to existing LDO designs, while remaining in the same overall footprint as the counterpart.
As LM1117 LDOs have a different pinout to the 78xx series of regulators, I designed two versions of the layout.
The annual Hackaday Supercon is taking place as Remoticon this year on November 6th to 8th. The talented Thomas Flummer has design a PCB badge based on the SMD challenge that can be further customized in KiCad.
The KiCad 3D Viewer has seen a few incremental improvements during the course of V6 development:
Plated and Non-Plated Copper
A subtle change has been made in MR#405 by Mario Luzeiro that affects how copper is rendered. The visual difference between plated copper pads and non-plated copper pads will now be visible as well as copper in general.
This image shows a ENIG plated copper hole compared to the surrounding copper traces when the soldermask was turned off.
For a previous project I explored what it would take to create a text marquee on an 8×8 LED matrix display without microcontroller, using only 7400 chips, an old EEPROM and breadboard components. Matrix Displays I was interested in using an LED matrix display and I picked up some cheap 8×8 ones on Amazon. medium.com That worked, but 8×8 is very small to do anything interesting and so I wanted to give it another go, create a larger 16×16 panel, design a custom PCB and ultimately hook it up to a microcontroller this time to write some games for it.
The Raybeacon is full-featured nRF52 based wearable, ultra-low power, multiprotocol development board designed for variety of embedded applications. Due to modular design, the device can be used to build your own production-ready appliance with minimal hardware modifications.
Key features include:
Coin sized – the board is only 25 mm in diameter
Works from a single CR2032 / CR2025 3V button cell
Nordic nRF52 high-end multiprotocol SoC supporting Bluetooth 5.x, Bluetooth mesh, Thread and Zigbee; of your choice:
nRF52833: Cortex-M4F 64MHz, 512KB flash, 128KB RAM, Bluetooth® 5.1 Direction Finding, 105°C temperature qualification
nRF52840: Cortex-M4F 64MHz, 1MB flash, 256KB RAM, Bluetooth® 5.0, ARM TrustZone® CryptoCell cryptographic unit
Automotive grade BOM components – ready for harsh environment
2 x tactile buttons IP67
1 x RGB LED
1 x infrared LED (850 nm) 0402 size
Socket for NFC flex antenna, compatible with Nordic FPC antenna and Liard 0600-00061. Can be configured as extra 2xGPIO.
Programmable through SWD port (removable Tag-Connect socket, on-board solder pads)
1.27mm pitch 2×4 receptacle to connect custom extension boards:
6 x GPIO ports
1 x 12-bit ADC input
pass-through VDD and GND pins
2.54mm pitch 1×8 pin header for fast breadboard prototyping; can be reused as 1.27 to 2.54 adapter
USB interface (on-board solder pads)
Minimal fabrication cost due to simple, two-layers only design