Power supply (battery, USB)

[LarryD]

@reiner_doll

Shifting battery power from 4.8 (accu) or 6 (battery) up to 8V with a little up-switching regulator. Then to Vin on Arduino Uno.

• Use a BOOST/BUCK converter (a bit more flexible), feed 7v into Vin.

• For students, replace the potentiometer with 2 resistors to get 7V.

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• However, these MT3608 Boost converters are good too.
  Select resistors for 7v out going to Vin on Arduino.

Share tips you have come across

In situations where an accidental change in a potentiometer setting can cause catastrophic problems, change the potentiometer out for fixed resistors. Make a resistor substitution board ahead of time to use it to determine what the values of these resistors should be. All the standard resistor values (SMD 1026) have been placed on the substitution PCB. One end of all the resistors are common and would represent the wiper on a potentiometer. Female headers on the other side of the resistors w…

Share tips you have come across

Further to post #730. Replacing a potentiometer with two SMD resistors has been covered earlier in this thread. Now we are using machine pin headers to raise the SMD resistors above the board rather than mounting them on Kapton tape. Use 3 header pins with the top pins cut off flush to the surface. Solder the 3 pins at the old potentiometer location. As before, after measuring the potentiometer setting, select ‘actual’ standard SMD resistors and confirm they will work in place of the pot. …