Prototype Version 1.2

A project log for Read Rope / Electronic Nerve

This is an open-source hardware project for a device that outputs a certain voltage depending on where the rope/wire is bent.

pablo-antonio-camacho-jrPablo Antonio Camacho Jr. 11/10/2019 at 18:290 Comments

I decided to change the resistors used so that the device can work with microcontroller ADCs. The ADC of the atmega328p of Arduino Uno microcontroller was considered.

A large simulation 100 Mega ohmload resistor was added at the output to simulate the input resistance of the ADC of the atmega328p.

Resistances of the resistors connected in series to path to circuit ground from output were changed to 1k,3k,7k,9k and track resistor was changed to 20k. These resistances were changed in order to have the output impedance of the circuit be 10k ohms at the resistor combination that gives max voltage. The output impedance needs to be 10k or less since the ADC of the atmega328p is optimized for signals that have an impedance of 10k or less.

The total cost of making 5 pcb prototypes would be TBD not including shipping cost and not including tubing to contain pcb prototype and push button when bent.

Parts List + Total Cost

Most Expensive to Least Expensive Items

  1. FlexPCB
  2. SPST-NC Tactile Switches
  3. 20k, 9k, 7k, 4k, 3k, 1k SMT Resistors

URL for Parts