Hello everyone, I am currently trying to put a project together , that uses:
- an arduino pro mini 3V3
- a 3 axis MMA7260 accelerometer
- an NCP1400 5V step up board
- Two 4094 shift registers
- Two sets of 8 green leds connected to the siftregisters via 500ohm resistors
- it all need to run on 4 AA 1,5 batteries max
This needs to be integrated into a juggling tool (diabolo), and have at LEAST 15 to 30 minutes of runtime.
Now the thing is , i have never worked on "portable" projects like this before, and i am somewhat worried about the power requirements: I have not yet recieved the arduino min, accelerometer, and step up board, but : - have experimented with a set of 8 leds connected to the shiftregister , on a standard arduino's 3V3 port that can normally only source 50 ma and i didn't run into any problems even with more leds -From the datasheet, it seems the accelerometer only needs 500uA -if i understand correctly the arduino pro mini uses around 25mA -The max current from the step up is 100mA
Am i missing anything or should it be ok ? One alternative approach i could use is to seperate the general power supply from the led power supply, using a sparre 3,3V step up, but in that case each step up would only have 2 AA batteries avalaible.
Any advice would really be welcome! Thanks in advance!