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VKey Voltage Keypad (Open hardware)

4 years ago 910
  • Description
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  • BOM
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Description

Description: This is the VKey Voltage Keypad, a simple board that adds a keypad to your microcontroller project without using multiple I/O pins. This keypad has 12 pushbutton switches in a 3x4 array. The VKey operates by outputing an analog voltage to encode which key has been pressed, which can be read by an analog to digital converter on a microcontroller on a single input pin.

Traditional digital keypad interfacing techniques can require a large number of digital I/O lines. On a small controller, there may not be many I/O pins left for other tasks. The VKey operates at a voltage of 3.3-5.5V and features a dual opamp which is used as a current source and buffer amplifier.

GitHub (Design Files) GitHub (Library) Sparkfun link:https://www.sparkfun.com/products/12080

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Documents

VKeyVoltageKeypad SCH

VKeyVoltageKeypad PCB

BOM

ID Name Designator Footprint Quantity
1 SWITCH-MOMENTARY-2 S1,S2,S3,S4,S5,S6,S7,S8,S9,S10,S11,S12 TACTILE-PTH-12MM 12
2 POWER OUTPUT JP1 1X03_NO_SILK 1
3 330 R5,R6,R7,R8,R9,R10,R11,R12,R13,R14,R15,R16 0603-RES 12
4 STANDOFF_ELECTRICAL S13,S14,S15,S16 STANDOFF-ELECTRICAL 4
5 LOGO-SFE LOGO1,LOGO2 SFE-NEW-WEBLOGO 2
6 .01uF C1 0603-CAP 1
7 OSHW-LOGO LOGO3 OSHW-LOGO-M 1
8 FRAME-LETTER FRAME1 CREATIVE_COMMONS 1
9 10k R1 0603-RES 1
10 1k R2,R17 0603-RES 2
11 1meg R3 0603-RES 1
12 100 R4 0603-RES 1
13 LMV358 U1 SO08 1
14 MMBT3906 Q1 SOT23 1
15 BAS16 D1 SOD-323 1
16 OSHW-LOGO LOGO4 OSHW-LOGO-L 1
17 FIDUCIAL FID1,FID2 MICRO-FIDUCIAL 2

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