Arduino Multiwii 2.4 Quadcopter can not Reach the Max Throttle

Projects General Guidance
1

This question is related to my 2nd Quadcopter projects:
I've been learning about Arduino quadcopter using Multiwii 2.4 Firmware. But I still get stuck on many things. I have a basic question that I must ask all the Arduino Quadcopter Expert in this forum, please help:

Problem: Throttle can not reach the max Throttle when I push the throttle stick to the top.
What is the most common problem causing it?

Specification:

  1. Firmware: Multiwii 2.4
  2. FIle Config.h (I uncomented these below):
#define QUADX
#define MINTHROTTLE 1150
#define MAXTHROTTLE 1850
#define MINCOMMAND  1000
#define I2C_SPEED 100000L
#define INTERNAL_I2C_PULLUPS
#define CRIUS_SE_v2_0  
#define EXT_MOTOR_32KHZ
#define MOTOR_STOP

I also try to uncomment board and sensor to:

#define LADYBIRD

and,

#define GY_521

  1. FLysky FS-i6 TX with 4Channel Flysky Receiver
  2. Motor Brushed 720 (with Syma Gear + Syma propeller)
  3. Lipo Battery 3.7v, 500mAh
  4. Arduino Pro Mini 5v 328p 16Hz
  5. CW and CCW configured correctly
  6. I also activate buzzer and led to see the possibility of the problem, but All sounds good (when powering on, connecting TX-RX and Arming the drone).
  7. DIY ESC = Mosfet TIP122 + Dioda in4007 (This is what I asked in this Electronic FORUM - installed and nice tested).
  8. Step up booster: 3.7v to 5v (5v is wired to VCC 5v Arduino board)

Note: Motors VCC is directy wired to the VCC in of the step-up booster. The VCC Out is to power arduino board.

Additional Info:
How do I know the max throttle?
I tried to connect the battery directly to the motor

Please help and sorry for my bad English language. Thanks

2

What does this do ?

3

value of max throttle in file config.h - it shows the max throttle when I push the TX throttle stick to the very top.
I tried to change it into 2000, but no luck.
The speed of propellers spin were Far different of - when I directly connected it to battery - without other wirings.

4

That darlington looses more than a volt from your motor supply.
You should be using logic level mosfets with a low Rds(on).

Not sure what those motors draw under load, but it's definately more than the 80-100mA stated on that website. You shouldn't need a boost converter for the motors, but you do for the Arduino.
Leo..

1 Like
5

I'll take a WILD guess and say it's something to do with the above.
To begin with, a TIP122 is a darlington transistor, not a mosfet.
Then I took a look at your bias setup.....ouch!!!! :open_mouth:

6

No, I directly wired the motor to the VCC battery.
(With the same ESC, other arduino drone can fly, but not mine.)

7

This is the second projects, the first can fly but not this 2nd one. I use arduino promini here. I think there's nothing wrong if I use pro mini instead of nano. In related to the diy ESC, it really can control the speed of the motor. I tested

8

if you think I went wrong with my setup, so please would you mind, please, to make it correct for me, pleaseee :slight_smile:

9

How did you match the Flysky TX to the flightcontroller? What is the procedure? Did you adjust the throttle ranges on the TX to match the ESC and flightcontroller?

I use YMFC32 auto and the calibration procedure is quite simple to understand.

1 Like
10

I never adjust anything in throttle range in fs-i6. Wait, I don't know what "throttle range" in the fs-i6 TX. :slight_smile: wait ... Well, I need time to understand it. Perhaps, tomorrow I will be back.

Okay, "YMFC32" (noted).

11

@Wawa and @bluejets, you're right :cold_sweat:
I find the solution here. Drone project: Motors spinning too slowly - #11 by groundFungus
Thanks.
(I will use: The IRFZ44N, since it is a Logic level Mosfet with a very low gate threshold voltage of 5V and has 0.1v drop voltage)
Guide: IRFZ44N: A Complete Guide on Using This MOSFET
Datasheet: IRFZ44N pdf, IRFZ44N Description, IRFZ44N Datasheet, IRFZ44N view ::: ALLDATASHEET :::

Screenshot_47
Screenshot_47852×390 25.6 KB

Noted: Drone project: Motors spinning too slowly - #16 by groundFungus
Nice explanation: https://www.youtube.com/watch?v=t6qDIbUjT2U
But, I think, IRL will be prioritized instead of IRF.

12

Poor choice. It's not a logic level fet.
The IRL44Z is (note the "L").
Leo..

1 Like
13

Thanks @Wawa for your choice. but ...
LOL, I force myself to choose IRFZ44N to be able to be an ESC. I know that "L" means logic level mosfet that matches to build an ESC. But you know? it worked as expected and can reach the max throttle. I had done with this "Z" for weeks.

Here's the LINK what I've done with it.

I mean I "force" it. And it is a must. I hate something limited and I have to find solution from something impossible to be possible :slight_smile:

I will upload the video tomorrow in YT.

Here's the demo to take off: Arduino Multiwii 2.3 Brushed Quadcopter.

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