I'm building a minidrone based on an eachine using the same components as the original but instead controlling it with an arduino nano, a bluetooth module and a 6 axis gyroscope. I had available 2 l293d's to drive the motors but the motors barely lift the drone. I was told the problem was that l293d is terrible option for lower voltage applications and I need to use low level mosfets(low Vgs) instead(also drones don't need to reverse the voltage of the motors).I'm planning to replace the H bridges with Si2302ds mosfets and shottky diodes.
Here are the respective datasheets :
and this is what I found about the motors :
1.Operating condition Rated voltage 3.4V DC Direction of rotation CW and CCW Operating voltage range DC2.0--4.5V DC perating temperature range -10-50°C Motor position all position
2.Mearsuring condition Motor position horizontal or vertical Power supply regulated DC power supply assuring unquestionable measuring regulated DC power supply assuring unquestionable measuring 10-30°C 30-95% If the judgment is questionable,Measurent is to be made based on JIS Standard Testing Condition(20+2°C,65+5% ) Direction of rotation viewed from output shaft side
3.Electrical characteristics Items Specification Standard value No Load speed 67000rpm±15% 67000 rpm No Load current 200mA max 180mA Starting voltage 0.8V max 0.5V DC Stall current 240mA±5% 240mA Terminal resistance 0.9Ω ±5% 0.9Ω Insulation resistance 10MΩ min AT 250V DC between motor terminal and case
I've been told that the stalling current given is wrong since a 0.9ohm motor resistance results in a 3.7 / 0.9 = ~4Amp stall current (not 240mA).
I will also power the drone with the same battery that the eachine uses:
Battery Power:3.7V 260MAH 45C
My main concern is if I'm choosing the right mosfet for this project. I'll appreciate any suggestions.