11.03 Long Signal Wires

Cat 5 Wire

Ethernet Cable comes with twisted pair wires that are designed for single transmission. They are easily found since many come bundles with consumer electronics devices

Connection Module

To get a Cat 5 cable to connect to and Arduino, use a module.

Capacitors for Noise

Use Cat 5 and one pair for power / GND and the other pair for signal and GND. A 100 nf ceramic capacitor from the Arduino input pin to ground can help filter out RF interference

Bypass Capacitors

• part 1 https://www.allaboutcircuits.com/technical-articles/clean-power-for-every-ic-part-1-understanding-bypass-capacitors/ 
• part 2 https://www.allaboutcircuits.com/technical-articles/clean-power-for-every-ic-part-2-choosing-and-using-your-bypass-capacitors/ 

Decoupling Capacitor Tutorial 

Difference between bypass / decoupling capacitors 

RS422 or RS485

Use RS422 or RS485 and twisted pair need MAX485 TTL to RS-485 Interface Module

• https://ipc2u.com/articles/knowledge-base/the-main-differences-between-rs-232-rs-422-and-rs-485/ 
• https://www.omega.com/en-us/resources/rs422-rs485-rs232 
• http://www.rs485.com/rs485spec.html 

Voltage Drop Calculator 

Without using specific module - debouncing  may help with just plain twisted pair wires.