ESP32-based wifi e-ink clock, using a Waveshare epaper display.

Code is at https://github.com/romkey/e-ink-clock

This is a work in progress. I’m still testing this hardware, and the software is incomplete. Build at your own risk.

Team SharpShooter power board V2.

Breakout from an Analog Devices/Linear Technology LTC4040 “2.5A Battery Backup Power Manager” IC. Boost SMPS with 5V out, and buck SMPS to charge lithium cell. Li-Ion selectable 3.95V/4.0V/4.05V/4.1V Lithium Iron Phosphate LiFePO4 selectable 3.45V/3.5V/3.55V/3.6V

https://www.analog.com/en/products/ltc4040.html https://www.analog.com/media/en/technical-documentation/data-sheets/4040fb.pdf

Package UFD, QFN 4mm x 5mm. 24 pins plus Exposed Pad. LTC4040EUFD

USB powered tamagotchi thing with an ATtiny85 brain.

A replacement for the internals of a BopIt XT for use in the Microsoft Intern Game 2020.

Rev 2

TinyLoRa Breakout board. Project files can be found here: https://github.com/condorxan/TinyLoRa

An experimental Intel D8008 computer that uses a TinyFPGA-BX board as the support circuitry… In order to power the system, it is required that an arduino uno (without the AVR chip) be connected to a nine volt battery , then the five volt pin must be connected to the 8008 computer board’s five volt connection, and the ground connection on the 8008 computer connected to the ground pin on the arduino board…

μStick

μStick (pronounced as “mu stick” or micro Stick)or uStick is a 32bit Arm Cortex M0+ based Arduino Compatible micro development board specially designed for battery driven projects/products. The board is released under CC-BY-SA 4.0

Features:

• Micro Dev Board (39mm x 15mm)
• ATSAMD11C14 – 32bit Arm Cortex M0+
• 16kb flash, 4kb SRAM
• Battery charging modes(user configurable with jumper pads):
  • USB 100mA
  • USB 500mA
  • Resistor settable charging current upto 1.6A
• Low noise and low dropout LDO upto 500mA
• Choosable EEPROM(16-512 MegaBit)
• Auto charging and system power management
• Charging status and power good indicator
• Button configurable for reset or general use (pin D15) with debouncing.
  • Use as reset (default), with bootloader entry via reset double-tap
  • Use as a general purpose button, with bootloader entry by holding during powerup.
• ESD protection on USB D+ and D- lines
• 9 solder jumpers on PCB bottom for configuration flexibility
• Arduino compatible (use the Arduino IDE to upload)

A small time-domain reflectometery add-on for your oscilloscope. See the project page for full details:

hackady.io project page

GitHub repo

Second version with a few adjustments to remove LED dead zone around zero and improve triangle output

Breadboard compatable breakout board for the STM32F722 microcontroller.

Find the BOM here

If you need to use alternate parts, be sure to match the package, value, and any other specifications given in the BOM description for that part.

FeatherWing Proto pcb, inspired by Adafruit FeatherWing boards. Compatible with Particle Xenon, Argon and Boron mesh devices.

A LoRaWAN node powered by an attiny85V and the RFM95W using a CR2032 coin cell battery. Including a smd button and ISP headers for programming.

Components:

• Attiny85v-10SU

• RFM95W (868 MHz LoRaWAN module)

• 10 uF capacitor (1206)

• KMR231 tact switch (4.2 x 2.8 mm, height 1.9 mm) OR you could solder something else to the pads, for example the 18010P vibration sensor switch

• CR2032 coin cell holder

• CR2032 coin cell

Add a wire antenna of length 82 mm to the ant1 connection (monopole). For coding: look at this for a good starting point: https://github.com/ClemensRiederer/TinyLoRa-BME280_v1.1/blob/master/ATtinyLoRa.cpp

TIP: The attiny85v can measure both the Vcc voltages and the temperature without using an extra pin. Link: http://21stdigitalhome.blogspot.com/2014/10/trinket-attiny85-internal-temperature.html

Dual-Resonance Solid-State Tesla Coil Thermal Limiter Board V1. For use with the Dual Resonance Solid-State Tesla Coil Driver V2.

Dual-Resonance Solid-State Tesla Coil Bus Capacitor Board V2. Used for mounting smaller, through-hole, bus caps to the DRSSTC Bus Supply V1 board. Requires 710-7461097 : Würth Terminals WP-BUFU Pin-Plate 16Pin Bush M6 180A.

Dual-Resonance Solid-State Tesla Coil 340VDC Bus Supply (from 120VAC only).

NOTE: This board has been replaced by the newer DRSSTC Bus Supply V2 design!

This version is designed to be used with large electrolytic capacitors, such as Cornell-Dubilier 500C series screw-terminal mount. The prototype circuit is using two 10,000uF 450VDC Cornell-Dubilier 500C capacitors. Or optionally, you can use the DRSSTC Bus Caps V2 board to mount smaller, through-hole, bus caps to this board using 710-7461097 : Würth Terminals WP-BUFU Pin-Plate 16Pin Bush M6 180A.

ERRATA: LED D3 and Opto-Isolator U1 cannot both be populated or else only one of the two will function, based on their required voltage drop. Both are designed as “HV Power On” indicators, only one is on-board and the other is remote. Decide if you want your indicator on-board or remote and populate accordingly. OR, you can modify the circuit so that D3 and U1 are in series instead of parallel. For that, cut the two traces leading from D4 to D3, and place a jumper between the anode of D4 (the LL4148) and the cathode of D3 (the visible LED). That will place the LED internal to the U1 Opto-Isolator in series with the visible LED D3 and allow both to function correctly (this is the preferred fix).

This board, along with the DRSSTC Bridge V2 replace the original DRSSTC Bridge V1.

Dual Resonance Solid-State Tesla Coil Full-Bridge V2.