2 layers158 × 11 mm
Daylight Matchstick
VoronDesign/Voron-Hardware
Cool Hardware designed by the Voron Design group
22 parts1.1kGPL-3.0
2 layers34.3 × 25.4 mm
Testbench
microtherion/LightAndLadderTestbench for Microcontrollers, consisting of some LEDs for digital/analog out, and a resistor ladder for analog in
- Size
- 34.3 × 25.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 22
- Nets
- 42
- Pads
- 98
- Tracks, vias
- 132, 9
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 25 Jun 2016
- Updated
- 25 Jun 2016
Overview
Testbench is an open-source printed circuit board by microtherion, from the microtherion/LightAndLadder repository on GitHub. It is a 2-layer board of 34.3 × 25.4 mm with 22 parts on 42 nets, routed with 132 tracks and 9 vias.
Its parts include 16 diodes and 2 connectors.
README
README.mdKiCad design of simple testbench for microcontrollers.
The resistor networks should be pairwise identical; I've used 680Ω for the LED resistors, with blue & green LEDs (note that the LEDs are connected to the closest pin, so top and bottom row are each connected to both resistor networks), and 1kΩ for the ladder resistors.
So what is the "ladder" part good for? It's the world's most primitive analog computer, a.k.a a voltage divider that can be used to generate a wide range of fractions of VCC, according to the formula printed on the board:
To generate a particular voltage, connect your analog input pin to one or several of the pins
in the top row (next to the +) and one or several in the bottom row (next to -).
If VCC (applied to the + pin) is 5V, then
+1/-1will generate5V * (1 / (1+1)) = 2.5V(as will+2/-2or+4/-4).+1/-2will generate5V * (1 / (1+2)) = 1.6V.+2/-1will generate5V * (2 / (2+1)) = 3.2V.+1/-1,-2will generate5V * (1 / 1+1+2) = 1.25V.
PCB available at OSH Park
Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | LED | LEDs:LED-1206 | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16 |
| 4 | 745-10 | resistor-array:resistor-array-745-10 | RN1, RN2, RN3, RN4 |
| 2 | CONN_01X13 | SparkFun-Connectors:1X13 | P1, P2 |
Questions
How big is the Testbench PCB?
It measures 34.3 × 25.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Testbench use?
22 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Testbench KiCad files?
From the microtherion/LightAndLadder repository on GitHub, at the commit this page was made from: the board is Testbench.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Testbench design in my own project?
Its repository states no licence, so its author keeps all rights: ask microtherion before reusing the design.
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