SKTHKPilot - Connected 3DR Power Module and ESC/SBEC power?I've found that when powering a HK Pilot off a 3DR Power Module alone, it will boot ok but as soon as I move a servo the HKP goes into a reboot loop. Uncool. I'd rather just power the HKP off a seperate BEC and just use the Power Module for volt/current sensing.Is there any issue having both power 'sources' connected to the HKP?
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Sounds like you neglected to remove the JP1 jumper. If you are powering using both the Power Module and a BEC, that jumper must be removed to isolate the two power feeds. Good thing you found out about it on the ground.
Yeah. I'm pretty ken on checking surface area controls and so on prior to launch so it became pretty apparent pretty qucikly something was not right. I had it it all up with the ESC +ve pin connected but after testing removed it thinking all would be fine. Obviously not.
Thx for the reply. Just to clarify, the Power Module wont power the APM if any servos are moved. I found that odd.
So my solution is to power the HKP with a BEC on the Output side. Are you confirming I need to remove the JP1 and having both the Power Module and BEC power will be safe then? No smoke and voltage/current sensing will be fine using the Power Module?
Well, it depends on if you got a "real" Power Module. There are a number of clonesters who sell what they call a 3DR Power Module, but it lacks a second small board that actually provides the 5 volts to the APM. Specifically the second, piggy-backed board is a Texas Instruments PTH08080WAH Voltage regulator. If you don't have this as part of the Power Module you have, it can't provide 5 volts. It can only do voltage and current measurement.
So lets assume your Power Module is complete. It will power the APM, a MinimOSD, your RC receiver and perhaps telemetry. It provides 5 volts to the input side. JP1 is the jumper plug that connects the input rail to the output rail. The best way to power something with servos is to use a Power Module to power the APM, remove JP1, and use a BEC or one of your ESCs to supply power to your output rail and any servos. You do NOT want to mix servos in to whatever circuit is providing power to your APM, as what you are experiencing will often occur. At best a servo can add noise on the power line to the APM, and at worst (which you are experiencing) the heavy servo current draw can cause the APM to brown out and reset.
Replies
Sounds like you neglected to remove the JP1 jumper. If you are powering using both the Power Module and a BEC, that jumper must be removed to isolate the two power feeds. Good thing you found out about it on the ground.
Gday Tom,
Yeah. I'm pretty ken on checking surface area controls and so on prior to launch so it became pretty apparent pretty qucikly something was not right. I had it it all up with the ESC +ve pin connected but after testing removed it thinking all would be fine. Obviously not.
Thx for the reply. Just to clarify, the Power Module wont power the APM if any servos are moved. I found that odd.
So my solution is to power the HKP with a BEC on the Output side. Are you confirming I need to remove the JP1 and having both the Power Module and BEC power will be safe then? No smoke and voltage/current sensing will be fine using the Power Module?
Well, it depends on if you got a "real" Power Module. There are a number of clonesters who sell what they call a 3DR Power Module, but it lacks a second small board that actually provides the 5 volts to the APM. Specifically the second, piggy-backed board is a Texas Instruments PTH08080WAH Voltage regulator. If you don't have this as part of the Power Module you have, it can't provide 5 volts. It can only do voltage and current measurement.
So lets assume your Power Module is complete. It will power the APM, a MinimOSD, your RC receiver and perhaps telemetry. It provides 5 volts to the input side. JP1 is the jumper plug that connects the input rail to the output rail. The best way to power something with servos is to use a Power Module to power the APM, remove JP1, and use a BEC or one of your ESCs to supply power to your output rail and any servos. You do NOT want to mix servos in to whatever circuit is providing power to your APM, as what you are experiencing will often occur. At best a servo can add noise on the power line to the APM, and at worst (which you are experiencing) the heavy servo current draw can cause the APM to brown out and reset.
This page describes in detail how to set up your power system.