APM2.5 5V/Vcc Schematic

Frequently asked questions are about powering an APM2.5 or why the same does not work or why it has failed.

Here is a simplified schematic showing the major components of the 5V/Vcc circuit on the APM2.5

Target Audience: Readers who do not have Eagle or are confused about using it.

You Need: Basic electronic schematic reading ability

Note that I have separated the PWM Output section into the upper left corner with a heavy purple line that is bridged by the jumper JP1 on the APM2.5. This is to emphasize that diode D1 passes current through JP1 (and drops voltage). The remaining energy is then called 'Vcc'.  Everything outside the purple corner is Vcc.

This is why the USB will power the APM2.5 when connected to a computer/USB hub. Note the fuse on the APM2.5 side of the USB connector AND another fuse on the output of D1. Another change from APM2.0 is the D4 6.0V Zener diode. If an over voltage is applied to the board, D4 will crowbar what it can to protect devices.

As with APM2.0, any 5V source connected to any of the indicated Vcc/5V points outside the purple corner (with GND of course) will power the APM2.5.

Also of note is the 'Mystery Port'. This port takes 5VDC before D1 and the fuse and is called 'JP_VCC'. Other clues to the mystery are the lines to 'ADC 12' and 'ADC 13'. A mystery indeed!

Any errors in this drawing from editing are mine.

I hope this can be used as reference for solving problems.

-=Doug

Tags: (UAV)-autopilot-hardware, APM2.5

Views: 13830

Attachments:

▶ Reply to This

Replies to This Discussion

Permalink Reply by moyesey on May 14, 2013 at 7:14am

When I connect power to my APM2.5, the leds ABC do not light up at all. I can contact the board through USB however. The ESCs are also not seeing the output pins except for pin 1. This has just occurred all of a sudden after several flights of having the board powered through the output side, with JP1 jumper connected.

Ewan.

Permalink Reply by Derek Vignard on Wednesday

hi

i dont know if im at the right place but i have a problem with my apm 2.5.2

after a calibration of my remote control nothing works.

when i plug the apm to usb the power up i see led red and blue flashing and after only red flashing

the tx and rx light always on, green led alive is on.

and nothing is detected in windows.

someone have an idea ?

thanks

 

Permalink Reply by R. D. Starwalt on Wednesday

This post is more for power connection issues but we do answer other questioins.

What is the application for your APM? Heli, Multirotor, Airplane, Rover?

How is the APM powered? If 2.5.2, are you using the 3DR Power Module?

-=Doug

Permalink Reply by Derek Vignard on Thursday

yes i use the 3DR module and Multirotor.

 

Permalink Reply by R. D. Starwalt yesterday

With USB connected, will the APM respond to a CLI?

What radio TX/RX are you using?

-=Doug

RSS

Social Networking

Top Content 

1 APM 2.5 from hobbyking

APM 2.5 from hobbyking
2 Alt_hold and loiter acting crazy

Alt_hold and loiter acting crazy
3 Mapping Mission Ride Along

Mapping Mission Ride Along
4 Looking for best laptop screen to see in the sun

Looking for best laptop screen to see in the sun
5 APM Copter 2.9.1.b has been released

APM Copter 2.9.1.b has been released
6 ArduPlane 2.73 released

ArduPlane 2.73 released
7 New micro-cameras emulate insects' compound eyes

New micro-cameras emulate insects' compound eyes
8 Hobby King Ardupilot

Hobby King Ardupilot
9 3 axis Camera Gimble connections.

3 axis Camera Gimble connections.
10 Thirty Days (#17): 12-rotor close up

Thirty Days (#17): 12-rotor close up

Contests

Season Two of the Trust Time Trial (T3) Contest has now begun. The fourth round is an accuracy round for multicopters, which requires contestants to fly a cube. The deadline is April 14th.

A list of all T3 contests is here. 

Groups

Advertisement

© 2013   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service