2 layers121.3 × 120.9 mm
Erun2
immonel/e-runout
This project is used to measure electrical runout by comparing measurements from touching probe sensors and Eddy current probes simultaneously.
38 parts
2 layers
A force-sensing Joystick using strain gauges
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 44
- Nets
- 59
- Pads
- 152
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 4
- Created
- 22 May 2017
- Updated
- 10 Feb 2018
Overview
Shield is an open-source printed circuit board by BerndGottschlag, from the BerndGottschlag/ForceSenseJoy repository on GitHub, published under the MIT licence. It is a 2-layer board with 44 parts on 59 nets.
It is built around the MCP3301-CI/P, INA2126U and LM385LP-1.2G. Its parts include 22 resistors, 5 capacitors, 5 connectors, 4 ICs and 2 diodes. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
MCP3301-CI/P
PDIP-8-40℃~+85℃ 100kHz 13 2LSB 4.5V~5.5V 50nA 78dB 85kHz~1.7MHz、1.7MHz Not supported SAR SPI Yes PDIP-8 Analog to Digital Converters (ADC) ROHSMicrochip TechnologyAnalog To Digital Converters (ADC)
INA2126U
SOIC-16-18V~-1.35V、1.35V~18V -40℃~+85℃ 0.1% 0.4V/us 100uV 10nA 175uA 2 2.7V~36V 30us 35nV/√Hz@1kHz 500nV/℃ 5V/V~10000V/V 5mA 5nA 94dB External resistor gain、Overvoltage protection SOIC-16 Instrumentation Amplifiers ROHSTexas InstrumentsInstrumentation Amplifiers
LM385LP-1.2G
TO-920℃~+70℃ 1.24V 20mA 60uVrms 80ppm/℃ 8uA Fixed Parallel ±0.3% TO-92 Voltage Reference ROHSHANSCHIP semiconductorVoltage Reference
README
README.mdForceSenseJoy
This joystick measures the force applied by the user and not the deflection as done by conventional joysticks.
Operating principle
The force is measured using two strain gauges each for the x- and y-axis. These strain gauges are used in a half-bridge Wheatstone bridge configuration. The signal from the bridge are amplified by an instrumentation amplifier and then read out using 13-bit analog-digital-converters. The LUFA library is used to create a USB-joystick device.
Status
At the moment there are some problems. The calibration of the Wheatstone bridges is far from perfect. On one hand this leads to a laborious adjustment process using the trim pots to balance the arms of the bridge and on the other hand the signal sometimes drifts over time. While the adjustment does not have to be perfect, as the center point (zero) can be set via software on the press of a button, a bigger imbalance of the bridges will make the amplifier to be unable to amplify the signal to its maximum amplitude. A possible sollution to this would be the adjustment of the reference voltage.
How to build
The make script is situated in firmware/src/.
The project can be build and flashed with
make avrdudeLicense
This project is licensed under the MIT License - see the LICENSE file for details
Parts
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 0 | Resistors_SMD:R_0603 | R1, R2, R3, R4, R5, R6, R7, R8, R15, R17 |
| 3 | 1 uF | Capacitors_SMD:C_0603 | C1, C4, C5 |
| 3 | CONN_01X03 | Pin_Headers:Pin_Header_Straight_1x03 | P2, P4, P5 |
| 2 | 0.47uF | Capacitors_SMD:C_0603 | C2, C3 |
| 2 | 10 | Potentiometers:Potentiometer_Bourns_3296Y_3-8Zoll_Angular_ScrewUp | RV1, RV2 |
| 2 | 100 | Potentiometers:Potentiometer_Bourns_3296W_3-8Zoll_Inline_ScrewUp | RV3, RV4 |
| 2 | 1K | Resistors_SMD:R_0603 | R19, R20 |
| 2 | 1k | Resistors_SMD:R_0603 | R21, R22 |
| 2 | 345 | Resistors_SMD:R_0603 | R9, R10 |
| 2 | 350 | Resistors_SMD:R_0603 | R12, R13 |
| 2 | 80 | Resistors_SMD:R_0603 | R16, R18 |
| 2 | LM385LP‑1‑2 | TO_SOT_Packages_THT:TO-92_Inline_Narrow_Oval | D1, D2 |
| 2 | MCP3301 | Housings_DIP:DIP-8_W7.62mm_LongPads | U3, U4 |
| 2 | SW_PUSH | Buttons_Switches_ThroughHole:SW_PUSH_6mm | SW1, SW2 |
| 1 | 10k | Resistors_SMD:R_0603 | R14 |
| 1 | ArduinoProMicro | Parts:ArduinoProMicro | U1 |
| 1 | CONN_01X02 | Pin_Headers:Pin_Header_Straight_1x02 | P3 |
| 1 | CONN_01X05 | Pin_Headers:Pin_Header_Straight_1x05 | P1 |
| 1 | INA2126 | Housings_DIP:DIP-16_W7.62mm_LongPads | U2 |
| 1 | R | Resistors_SMD:R_0603 | R11 |
Questions
What parts does the Shield use?
44 parts, built around the MCP3301-CI/P, INA2126U and LM385LP-1.2G. 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 Shield KiCad files?
From the BerndGottschlag/ForceSenseJoy repository on GitHub, at the commit this page was made from: the board is schematics/shield/shield.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Shield design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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