Shared Projects by SmittyHalibut

UPDATED 2016-12-21: Fixed filter calculator links. They now point to a) high pass instead of low pass, and b) T configuration instead of Pi. Sorry for the confustion.

A simple RF Highpass Filter. Component values are dependent on your filter requirements. I made this as an AM broadcast band blocker, cut-off at 1.7MHz. But you can put whatever values you want on it.

This board will work as either Butterworth filter (eg: http://www.calculatoredge.com/electronics/bw%20tee%20high%20pass.htm) or Chebyshev filter (eg: http://www.calculatoredge.com/electronics/ch%20tee%20high%20pass.htm). Put in your cut-off frequency, impedance is probably 50 ohms, and 7 components. (For Chebyshev, you’ll also need to specify the pass-band ripple tolerances.) Then click Calculate, and those are your component values.

This board will take either 1206 SMT capacitors, or .1" radial capacitors. It’s laid out assuming FT37-43 toroids for the inductors, but will probably work with axial pre-made inductors too, they just won’t lay flat on the board. The SMA connectors will take either vertical or edge mounted SMA connectors.

A controller board for a clock based on the ESP8266 uC. It will control a 60x WS2812 LED ring and turn it into a clock. There are also three analog outputs to make an Analog Panel Meter clock (the software isn’t written for this yet.)

This is an implementation of Jon Fuge’s wonderful Wol Clock project on Instructables: http://www.instructables.com/id/Wol-Clock-ESP8266-12E-60-LED-WS2812B-Analogue-Digi/?ALLSTEPS All software credit is his. I’ve modified it to use the -01 version of the ESP8266, and added the analog bits.

It uses the venerable (and cheap!) ESP8266-01 boards, about $2 from eBay: http://www.ebay.com/itm/171907296150

An example of the 60 WS2812 rings: www.ebay.com/itm/131594455055 There are several options available, they’ll all work.

All other parts are non-critical.

See https://www.youtube.com/watch?v=3o8EZLghdRY for the layout of this board.

A 6x6 matrix Qwerty keyboard for microcontrollers.

Now with backspace!

NOTE: The 30uF spec’d on the board is not sufficient to let an (read: my) FTDI serial cable (mine is actually PL2032) power the ESP8266. The ESP draws down the power line too much and the serial chip looses sync with my PC’s USB host controller. Either add more bypass caps (100uF or so?), or power it from an external 3.3v power source.

An ESP-1 ESP8266 breakout board. Includes:

• Pins spaced for breadboard use
• An FTDI serial header
• Reset and Program buttons
• Optional solder-blob chip enable
• 10k pull-up on Reset
• 3x 10uF power bypass caps (needs more than this if you intend to power it from your serial cable)

To put the ESP8266 into the programming state, push and hold the Program button, then push and release the Reset button, then release the Program button. The ESP8266 is now in Program mode and appears to stay there until you upload your program.

A simple T/R switch. Takes +5v and an Active High PTT.