ESCs

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  voxl Tmotor f55 esc
  • bensusana  

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  Hello @ErezI, Can you please describe your setup? Specifically, in your first test, how are you connecting to the Tmotor ESC and where are you running voxl-esc tools? (on your PC or VOXL2 ?). Did you make your own cable for UART communication? ./voxl-esc-scan.py command will automatically try all typical baud rates, including 2Mbit and should detect the Tmotor ESC. Alex
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  VOXL ESC Mini 6s support
  • ATMA  

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  Hi @ATMA We are evaluating our ESC products for 6S support. We are confident we will have at least one design that can support it with a design sku you would order from our website. Please stay tuned, might be a couple months before we have something. Thanks
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  VOXL ESC Mini with VOXL2
  • msberk  

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  VOXL 2 Mini is powered at 3.8V and VOXL 2 is powered at 5V. So, there will be a slight hardware change for the Mini ESC to support VOXL 2. We do plan to have that as an option in the next month or so. It is a PCB stuffing option for 5V
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  ModalAi ESC v2 RPM issue
  • A Former User  

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  @Alex-Kushleyev Thank you so much for your response. We tested ESC with some other motor and found out RPM and power was exceeding 10000 RPM / 60% power and everything seems to be good with ESC. Our motor must be damaged or there is some problem. I will consider your feedback for motor selection as well. Thank you!
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  VOXL ESC to VOXL2 cable problem
  • Eloi  

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  Hi @Eloi , Thanks for the feedback, our website is out of date and the the MCBL-00029 should have been included, let me work with our team and we'll get you a cable in the mail to resolve, I'll send an email to your address here.
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  ESC feedback
  • Moderator  

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  Fixed the problem, the mavlink stream name is SERVO_OUTPUT_RAW_0. changing that to 200Hz gives us the RPM feedback at 200Hz on mavros
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  VOXL ESC calibration + T-Motor F2203.5 3550KV
  • mbahrami  

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  Please follow the steps here at https://www.modalai.com/pages/rma
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  ESC calibration guide
  • Tamas Pal 0  

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  Without propellers you are not calibrating the ESC
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  VOXL ESC power
  • mbahrami  

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  No flow control.... really just need GND, Rx, Tx
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  what is the ESC signal to control the motor?
  • DarkKnightCH  

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  Hello @DarkKnightCH , the mixer file does not only define the AUX1 and AUX2. Please note this line, which specify the configuration of a quadrotor in X orientation : https://github.com/modalai/px4-firmware/blob/1.11.3/ROMFS/px4fmu_common/mixers/quad_x.main.mix#L1 , specifically R: 4x
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  Repurposed VOXL ESC v2 params
  • hmlow  

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  @Alex-Kushleyev When using RPM control, the mapping between thrust and RPM is usually an almost perfect quadratic, so you should probably use THR_MDL_FAC = 1 to make it quadratic. However, let me double check that last point.. The value of this parameter should not change when you change motor / propeller, since thrust is almost always a pure quadratic vs rpm. Hi @Alex-Kushleyev , did you manage to find out if THR_MDL_FAC should be set to 1 or should i calibrate the thrust curve? PX4's docs specified in https://docs.px4.io/v1.12/en/config_mc/pid_tuning_guide_multicopter_basic.html that if the ESC is a RPM-controlled one, no tuning is required: For PWM controllers, 0.3 is a good default (which may benefit from further tuning). For RPM-based controllers, use 1 (no further tuning is required as these have a quadratic thrust curve). But i noticed from ModalAI's reference params (eg Seeker's https://gitlab.com/voxl-public/flight-core-px4/px4-parameters/-/blob/master/platforms/v1.12/Seeker/Seeker_v1_param_rev_A.params) that the you guys did a calibration regardless # Dyno test shows this model should be 0.90 1 1 THR_MDL_FAC 0.90 9
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  Query regarding connecting bigger ESCs
  • howard  

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  Hello Swaroop, The ModalAi ESC can support most common motors. The ESC is rated for 2-4S battery voltage. The current rating is 15-20A continuous (per motor), depending on air cooling. What motors / propellers are you considering using with ModalAi ESC? We have some tools and calibration procedure for adjusting ESC parameters for new motors : https://gitlab.com/voxl-public/flight-core-px4/voxl-esc/-/blob/master/tools/calibration.md Regarding support of 8 motors, the ModailAi ESC has hardware support for using two 4-in-1 ESCs on a single UART connection (8 ESC channels with IDs 0-7). However, our PX4 ESC driver does not currently support more than 4 motors. Alex
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  Odd temperature shown on VOXL ESC v2
  • hmlow  

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  Thanks @Chad-Sweet and @Alex-Kushleyev for the suggestions. Indeed it was a faulty ESC. Swapped it out and all temps are look fairly similar. On idle (room temp 25deg), the ESC temp stabilizes at around 50 odd degrees C.
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  VOXL ESC Calibration Voltage Drop
  • Steve Turner  

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  Hello stevet, The reported voltage is the voltage measured by the ESC. In fact all 4 ESCs on the 4-in-1 ESC measure the voltage, you can try to run the calibrate script on others and double check the result. The current of 2.9A for a motor similar to EMAX 1306B is quite reasonable, in fact is probably on the low side (not a concern). If you are using a power supply that is capable of outputting 7.4V at much higher amps (lets say 10A), then follow these steps to figure out what is wrong: when ESC reports 2.9A, check to make sure the power supply also reports the same or similar current. run the calibration on a different ESC id to make sure the voltage measurement is similar to your first test use a multi-meter to measure the voltage right at the power input pads of the ESC (may need to solder temporary wires to ESC and connect them to multi-meter in order to do it safely.. use your judgement) the multi-meter voltage measurement should match very closely the voltage measured (under load) in the ESC the issue is most likely in the wiring between the power supply and the ESC (including possibility of a bad connector or bad solder joint at the connector). Alex
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  ESC rail power issue
  • Jimk_Aero  

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  Our PWM breakout board does not have the positive rail connected.
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  ESC won't calibrate
  • Jimk_Aero  

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  Thanks for your suggestions. I ran the pwm test command in the MavLink console and confirmed all motors except the suspect one so looks like I'm going to replace an ESC. I do appreciate your guidance.
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  BLHeli_S ESC Compatibility
  • jbruell94  

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  Yes, BLHeli ESCs are supported with VOXL Flight and Flight Core. See documentation here: https://docs.modalai.com/voxl-flight-datasheet-connectors/#j1007---8-channel-pwm--4-channel-dshot-esc-output-connector The ModalAI ESC has a number of advantages for tightly integrated products: Digital / UART communication Closed loop RPM control produces generally more efficient systems Feedback control to detect obstruction or motor failure. Built in USA We will bring this back in stock once we can source the appropriate MCU. The chip shortage is especially relevant to motor controllers
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  Turn off ESC Beep
  • PawelJ  

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  @m4v3r said in Turn off ESC Beep: e Oh that's great news! Thanks a bunch, I'll have to try this out
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  Parameter Checksum Invalid (ESC)
  • Adarsh96  

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  Hi Adarsh, Software version 34 is the latest, so you should be OK. It looks like you are using some old software tools. Can you please get a clean check out of voxl-esc (master) repo and follow instructions to obtain voxl-esc-tools-bin : https://gitlab.com/voxl-public/flight-core-px4/voxl-esc/-/tree/master/tools (see readme). You probably have some old code from when we released it from Qualcomm and the parameter struct has changed since then. Alex