This drone consumes a lot of mAh in 2 minutes

Hi All. Now I'm here to know about my problem related to my micro brushed quadcopter (arduino drone). Here's the detail:

Demo Video:

Components/parts:

  1. Firmware: multiwii 2.3
  2. Battery: LiPO 650 mAh, 1S, 25C
  3. DC-DC step up boost Converter: 3.7v to 5v (1 Ampere)
  4. 720 Coreless DC Motor
  5. Wires: AWG 28
  6. Sensor: MPU6050 (GY-521)
  7. AMS1117 3.3v breakout for GY-521
  8. FS-iA6 Receiver Flysky + TX FS-i6
  9. Board: Arduino Promini 5v 328p
  10. Brushed DIY ESC: 10K resistor + si2302/IRL520n + Dioda in5819
  11. Propeller 75mm and 60mm
  12. Capacitor: 100uf 25v on Output (VCC/GND) of the step-up booster.

Circuit Diagram: (I designed by myself)

Here's the update of ESC (from the ESC on the above)

diy-brushed-esc

What I set up in the config.h:

  • QuadX
  • Ladybird
  • minThrot/maxThrot: 1050/2000
  • #define INTERNAL_I2C_PULLUPS
  • #define MOTOR_STOP
  • #define EXT_MOTOR_RANGE

THE PROBLEM IS:

**I can only play the drone 2 minutes** then I must recharge the battery. It looks it consumes so many voltages (mAh). I saw other projects and could fly in 5 to 10 minutes using 500mAh. It frustrates me.

Add1: Besides, the motors go hot and I'm sure that the cause of the heat is the weight. The drone weight (with the battery) is 95 grams ( I used Ice Cream Stick and doubled it to make it tough.

Add2: I also try to use 820 and 8520 DC Motor but it looked the same.

The update (using si2302 with the same circuit designed):

Are you using their EXACT motors?

First I use 720 then 8520 then 820. The result is not far different. At first, I followed many instructions in YT tutorial and many forums, but no luck. My drone had big problem: it could not lift (take-off). But I experimented by myself and compare all the things with the tutorial and I found some useful decision to build a brushed drone using multiwii firmware.

Finally, it can take off but consumes a lot of mAh and the motors go hot.

So you don't know what motor they are using. What about propeller pitch and blade length? Are they the same as your example machine?

Of course I know. They used SYma Gear + 720. Other projects use 8520 with no gears with the motors.

Unfortunately, they didn't report if they got through with the heat of the motors - as many tutorials were in YT - only gives simple tutorial, not the detail one - of course, it will take many videos to record.

First, I tried as they did: some works, some didn;t. I also tried to use the 55mm, 65mm and 75mm propellers. I also select the thrust of the propeller and get the best one. (without selective choice, propellers can not lift the drone, so I must select the best thrust)

Pssst: I asked my problem to chatGPT and it said that the problem is the WEIGHT. But, I don't trust "him" although I know that one of the problems is the weight.

Do you trust the capacity label of your battery?

Oops! yes :pensive: :pensive: :pensive: and I don't know exactly about it and how to find the "true" one. I hope you can give me "the clue" to KNOW exactly the best 650mAh for my drone. ( I bought the cheap one :pensive: low budget, brother.)

Here's the link.

Sorry: it shows 65C.

How much does a drone that flies 5 minutes weigh?

95 grams (with the battery).

I'm sorry, it's not my area of knowledge. Just wanted to suggest it as a possible concern.

Maybe there is a way you can measure the true capacity of your battery, to see if there is an issue.

Thanks sooo much. Okay, I'll do some experiments again about the battery capacity.

Measure the power usage of each individual component as well. Tether the drone so you can simulate actual flight power usage while still being able to attach leads to measure with.

But, do you think the heat reduces the capacity or currents? if it is true, then the weight is the real problem.

If the successful drones weigh the same as yours, do you really suspect that weight is the problem?

Sure, I'm checking right now.

70% suspected problem. That's why I asked about my problem here to know exactly the problem is. Based on my drone's specification, It will be harder to reduce the weight.

If others are successful with same weight drones then you are correct in exploring excessive current consumption of your design or inadequate capacity of the battery. I think you will find the problem.

Okay thanks. I will focus on:

  1. weight
  2. battery capacity.

(I'm checking right now, wait ...)

One quick way to compare battery capacity is by weight. For new batteries, more weight means more active material in the battery.

And how much does your drone weigh?