A small, compact ATmega32u4 on a USB stick!

This board adapts the GPSDO diagnostic port to RS-232. You get to select whether to transmit the diagnostic output or the GPS NMEA output. PPS is sent to DCD, and is positive-oriented (that is, DCD asserts on-time).

The SOIC-16 chip is a MAX232. The SOT23-5 is a single inverter. All 6 caps are 0.1 µF. The edge-mounted DB9 should be a female. It can connect directly to a DB9M style serial port or cable. The diagnostic connector is a CUI MD60S. You use a straight-through mini-DIN-6 cable (like a PS/2 cable) to connect up to the GPSDO.

For maximum stability, you should keep this board connected permanently if you’re going to use it. Adding and removing powered loads on the diagnostic connector can have a short term stability impact.

This board adapts the GPSDO diagnostic port to USB. You get to select whether to transmit the diagnostic output or the GPS NMEA output. PPS is sent to DCD, and is positive-oriented (that is, DCD asserts on-time). The USB interface is a CDC device. Open it and set it for 9600 baud 8N1.

The SSOP chip is a CY7C65213. The SOT23-5 chip is a single inverter. The USB connector is a microB one. The diagnostic connector is a CUI MD60S. The passives:

• R1 - 10kΩ
• R2 - 4.7kΩ
• R3 - 1MΩ
• C1, C2 - 0.1µF
• C3 - 1µF
• C4 - 2.2µF
• C6 - 4700pF

RPUno

ATmega328P based controller board with pluggable connections. ICP1 pulse sensor (e.g. flow meter). Six digital I/O (3,4,10,11,12,13) with level shift in two pluggalbe groups that have a current source. Two analog channels (ADC0, ADC1) with 22mA current source for sensor loop. Power with 7 thru 36V DC.

GitHub Forum HackADay

Ham radio TNC based on the CHIP Pro from Next Thing co

Check http://ainslies..net/?p=14307 for BOM and assembly instructions

Do Ping 2 UI

Its a basic breadboard friendly breakout board for ESP-12E module, for from the scratch experimentation

V1 by Tete

Middle_Man Board for Intelisole

433 MHz, use with a TI CC1101 active transceiver.

Find the BOM on Google Drive.

A board for building a James tone stack directly on the back of a pair of 16mm pots. Uses the capacitor and resistor naming convention from the Duncan Amps Tone Stack Calculator.

CircuitPython mascot in the form of a development board. See https://hackaday.io/project/27579 for details.

This circuit is used to start a virtual pipe organ computer when the console has a pair of Start/Stop momentary contact switches. Power is drawn from an ATX power supply that can produce enough current to actuate all of the console’s solenoids that control the combination action. A 2-conductor wire is connected from the circuit board to the power switch of the PC. The PC is tied into a master outlet of a power strip. The ATX power supply is plugged into one of the switch outlets. When the PC is powered off, only the console’s Start button will turn on the PC. After the PC has been powered on, on the console’s Stop button can be used to turn it off.

Parts List:

RL1 - LittleFuse HE721C0510 Reed Relay

R1 - 10-Ohm, 10-Watt Wirewound Resistor (Dale CP-10 / Radio Shack 2710132)

24-pin ATX Power Harness

OpenCM and XBee and Dynamixel Bus host board

Cost: $4.15 for three.

Description: 10x analog sensor signal differential amplifier. Connect ‘IN+’ and ‘IN-’ to analog voltage signal. Connect ‘BUS’ and ‘GND’ to +11-30V DC supply. Connect ‘OUT’ to desired system input. Board is configured to use ¼" quick-connect tabs, but wires can be soldered directly if desired.

Digi-Key shopping cart here. Populate PCB as indicated on silkscreen.