Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a Seeed Studio nRF52840 microcontroller, a 3.7V LiPo battery, resistors, an operational amplifier (OPA688P), a rotary potentiometer, and a force sensing resistor. The circuit is designed to interface various sensors and components with the microcontroller for data acquisition and processing.

Component List

Seeed Studio nRF52840

• Description: A microcontroller module based on the nRF52840 SoC.
• Pins: VUSB, GND, 3V3, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, NFC1, NFC2, B-, B+

3.7V LiPo Battery

• Description: A rechargeable lithium polymer battery.
• Pins: +Ve, GND

Resistor (470k Ohms)

• Description: A resistor with a resistance of 470k Ohms.
• Pins: pin1, pin2

Resistor (51k Ohms)

• Description: A resistor with a resistance of 51k Ohms.
• Pins: pin1, pin2

OPA688P

• Description: An operational amplifier.
• Pins: NC, Inverting Input, Non-Inverting Input, -Vs, VH, +Vs, Output, VL

Rotary Potentiometer

• Description: A variable resistor with a resistance of 10k Ohms.
• Pins: leg1, wiper, leg2

Force Sensing Resistor

• Description: A resistor whose resistance changes with applied force.
• Pins: pin 0, pin 1

Wiring Details

Seeed Studio nRF52840

• GND is connected to:

  • Resistor (51k Ohms) pin2
  • OPA688P -Vs
  • Force Sensing Resistor pin 0

• Pin 1 is connected to:

  • Resistor (470k Ohms) pin1
  • OPA688P +Vs

• Pin 0 is connected to:

  • Rotary Potentiometer wiper
  • OPA688P Output

• B- is connected to:

  • 3.7V LiPo Battery GND

• B+ is connected to:

  • 3.7V LiPo Battery +Ve

3.7V LiPo Battery

• GND is connected to:

  • Seeed Studio nRF52840 B-

• +Ve is connected to:

  • Seeed Studio nRF52840 B+

Resistor (470k Ohms)

• pin1 is connected to:

  • Seeed Studio nRF52840 Pin 1
  • OPA688P +Vs

• pin2 is connected to:

  • Resistor (51k Ohms) pin1
  • OPA688P Non-Inverting Input

Resistor (51k Ohms)

• pin1 is connected to:

  • Resistor (470k Ohms) pin2
  • OPA688P Non-Inverting Input

• pin2 is connected to:

  • Seeed Studio nRF52840 GND
  • OPA688P -Vs
  • Force Sensing Resistor pin 0

OPA688P

• -Vs is connected to:

  • Seeed Studio nRF52840 GND
  • Resistor (51k Ohms) pin2
  • Force Sensing Resistor pin 0

• +Vs is connected to:

  • Seeed Studio nRF52840 Pin 1
  • Resistor (470k Ohms) pin1

• Output is connected to:

  • Seeed Studio nRF52840 Pin 0
  • Rotary Potentiometer wiper

• Inverting Input is connected to:

  • Rotary Potentiometer leg2
  • Force Sensing Resistor pin 1

• Non-Inverting Input is connected to:

  • Resistor (470k Ohms) pin2
  • Resistor (51k Ohms) pin1

Rotary Potentiometer

• wiper is connected to:

  • Seeed Studio nRF52840 Pin 0
  • OPA688P Output

• leg2 is connected to:

  • OPA688P Inverting Input
  • Force Sensing Resistor pin 1

Force Sensing Resistor

• pin 0 is connected to:

  • Seeed Studio nRF52840 GND
  • Resistor (51k Ohms) pin2
  • OPA688P -Vs

• pin 1 is connected to:

  • Rotary Potentiometer leg2
  • OPA688P Inverting Input

Code

No code is provided for this circuit.