I eventually ended my wiring of 3 sensors to Arduino nanom as following:
- one Arduino nano CH340 (acceptable quality clone), yes it can deliver 3.3 V when powered by Vin;
- one YouRobot Breadboat source - I use only the 5 V output to easy the transition to battery;
- one level shifter - Chinese clone of a a retired Sparkfun - I2C to BMP280, powered from Arduino nano on the low voltage end
- one BMP280 at 3.3 V (Chinese clone - I hate this sensor) SCL SDA via level shifter
- one DHT 22 at 5V -at D2 Arduino nano
- one 4K7 /0,25 W resistor (sooo tiny) Signal to 5V of DHT22
- one 1604 5V LCD -4 rows, backpack I2C -to Arduino nano
- one TEMT 6000 to 3.3 V - A0 Arduino nano
All these fellows are happy on the following beds:
- one breadboard 540 p (acceptable quality) - for the Power source
- one mini breadboard - Yellow - for the Arduino nano
- one mini breadboard - Red - for the level shifter
- one mini breadboard -Green - for the 3 sensors (DHT22, BMP280, TEMT 6000)
- an incommensurate number of Jumpers
External power is a 7 V ACDC (“If you want blood!” - my tomcat loves it)
I added 3 miniature Voltmeters to check 5V respectively 3.3 on the way - I made them their own libertarian pins (higher than the others on the bed so they cant disturb the others).
To come to the point - there is a terrible mess of wires - see the attached photo.
I kept some track by using mini colorful breadboards and miniature voltmeters, while feeding all directly from the source whenever possible. But, still it is still difficult to follow each wire.
I would like to have a common rail of ground to which to clamp each individual ground, including the source one (“Thunderstuk”).
But besides this, I cant figure out how to manage the wires in a clean net way. I imagine it should be something like structured programming in the world of wires.
Because I want to show all these items to children, I am now allowed by law to use PCBs.
I google it but because of high number of companies in wire management and because of the PC networking I could not get through.
Question is: could you please be so kind and point me to a free resource of electric wires management?
Thank you very much!