Shared Projects

An audio shield for Trinket M0.

A prototyping shield for Trinket.

Original Credit - https://github.com/Gutenshit/CANBadger

Three DHT11 sensors attached to ESP8266

250S+

pcb

LayerOne Demoscene Board v4 by arko

Changed EEPROM select jumper to A02.

This driver has an input range of 1.8V to 5.5V (so 1 cell LiIon or 2-3 1.2V-1.5V cells), and can supply an LED with a voltage between 1.2V and 5.5V. Maximum output current depends on the input and output voltage, but it can be calculated with a few formulas in the TPS63020 datasheet. Keep in mind, this driver has no low voltage cutoff! You have to check your battery voltage regularly!

There are 3 pads on this board. The middle one has to be shorted with one of the outer ones. This for the power save mode. Short it with the outer pad marked with “D” to disable it (>150mA), or short it with the other pad marked “E” to enable it (<=150mA).

For a parts list, look here: Budget Light Forum

The current can be programmed via one resistor R3. When the parts listed are used the formula is:

Resistance (R3) = (2000×I)/(0.5V-0.02Ω×I) (Current in A, Resistance in Ω)

Replace the “I” with your current you want. If you want a really low current , please change the current sense resistor (R1) to something bigger, and maybe change R2 as well.

To calculate current with your own parts, use this:

R3 = (R1×I×R2)/(0.5V-R1×I)

The OpAmp has to be chosen to fit the application. This depends on the input voltage range.

Some criterias to look out for:

• 20MHz bandwidth (depends on the amplification factor you have in your application, but 20MHz should be good for most things)

• Correct input voltage range

• Input offset, again depends… but <=500uV should be good

Important: Look out how the input voltage offset changes over temperature and changes in supply voltage! This should be low.

First test by Lexel - it works!

VUSB host https://www.instructables.com/id/ATtiny-V-USB-Project-Board/

SAMD21G18A Sensor Board with Color Oled

This Sensor Board is yet another variation of the other one on my site. It is not for sale with no real purpose in mind. It was created as design challenge. My full time job is pcb design work and as a hobby I enjoy experimenting with new design ideas. This was one of the more challenging designs I’ve worked on in a while. A few times I’d given up on routing it. Evan using four routing layers I found it tough. The idea was to hide the bezel of the display behind the board but have sensor components on that same board. It would look something like a little tiny television with all the components around the edges. This latest revision has fixed a few issues I found on previous versions but the design idea can possibly help others in some way. Full credit goes to Adafruit for publishing the Feather M0 design files along with the bootloader. I used the Feather design to create the schematic for my board. Credit also goes to Microwavemont on Tindie and the SSD1331 library that he has on his site compiles error free using the Arduino IDE.

The assembly instructions are at: https://0miker0.wordpress.com/samd21g-sensor-board-with-color-oled/

Feel free to email me at [email protected] with questions and follow me @mikerankin on twitter.

Rx module for musicFromMotion, as seen on calcium3000.wordpress.com