Hi Y'all

I have been tinkering with my new Elrs Mobula 7 to control it with my Jumper T-lite with external Elrs nano aion unit.
I've got them to bind with a passphrase whilst loading the latest firmware.
I've also tried to set up switches on the T-lite for Rates and Flip over/Beeper and they may be set ok but...
BUT I set Aux1 to Arm on switch C and when I flick the switch and the throttle is set to zero the whoop leaps into the air!
Another thing I've noticed when connected to Betaflight configurator is that the pitch seems to rotate in reverse.

I have watched JB's, OL's and Datfpv's YT videos, but I'm getting more confused!
Any helpful pointers would be much appreciated.

All the best

Go to the BF receiver tab and make sure your channel mapping is set to the same as your raido (AETR vs TAER). When you move the sticks on your radio, the respective sliders on the tab should move exactly per your stick inputs. Pushing forward on pitch will increase the slider and back will decrease, if somehow this is reversed then you would need to invert that input or channel on your radio.

If your drone is flipping out when arming, then double-check the prop/motor directions, they should match exactly to the diagram in the motors tab. Otherwise check your board orientation, the quad should tilt exactly the same as the 3D model in the setup tab.

(12-Aug-2023, 05:11 PM)mstc Wrote: Go to the BF receiver tab and make sure your channel mapping is set to the same as your raido (AETR vs TAER). When you move the sticks on your radio, the respective sliders on the tab should move exactly per your stick inputs. Pushing forward on pitch will increase the slider and back will decrease, if somehow this is reversed then you would need to invert that input or channel on your radio.

If your drone is flipping out when arming, then double-check the prop/motor directions, they should match exactly to the diagram in the motors tab. Otherwise check your board orientation, the quad should tilt exactly the same as the 3D model in the setup tab.

On the receiver tab everything is ok except the pitch, which is reversed. AETR is ok.
I can't tell if the motors are rotating correctly because the whoop just jumps in the air then stops.
The props should rotate slowly on arming and then increase speed on operating the throttle - That doesn't happen!

Does it jump straight up, or flips into the air. If it flips, then most likely prop/motor direction or board orientation is not correct.
For board orientation you can check it in BF with the 3D model, tilt the roll and then pitch axis, it should match exactly otherwise you may need to rotate the board alignment setting on the configuration tab.
If you plug in the battery while you are connected to BF, you can go to the motors tab and spin up the motors one by one. The motors should also match the ones in the diagram (ie motor 1 is in the rear right corner). You will have to check the "I understand the risks..." before you can activate the motor sliders - make sure no cables are in the props way before you do. Spin up slowly just until you feel the air blowing downwards, if it is blowing up then it is reversed or you have the wrong prop on the motor.

(12-Aug-2023, 08:39 PM)mstc Wrote: Does it jump straight up, or flips into the air. If it flips, then most likely prop/motor direction or board orientation is not correct.
For board orientation you can check it in BF with the 3D model, tilt the roll and then pitch axis, it should match exactly otherwise you may need to rotate the board alignment setting on the configuration tab.
If you plug in the battery while you are connected to BF, you can go to the motors tab and spin up the motors one by one. The motors should also match the ones in the diagram (ie motor 1 is in the rear right corner). You will have to check the "I understand the risks..." before you can activate the motor sliders - make sure no cables are in the props way before you do. Spin up slowly just until you feel the air blowing downwards, if it is blowing up then it is reversed or you have the wrong prop on the motor.

Hmm

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(12-Aug-2023, 08:39 PM)mstc Wrote: Does it jump straight up, or flips into the air. If it flips, then most likely prop/motor direction or board orientation is not correct.
For board orientation you can check it in BF with the 3D model, tilt the roll and then pitch axis, it should match exactly otherwise you may need to rotate the board alignment setting on the configuration tab.
If you plug in the battery while you are connected to BF, you can go to the motors tab and spin up the motors one by one. The motors should also match the ones in the diagram (ie motor 1 is in the rear right corner). You will have to check the "I understand the risks..." before you can activate the motor sliders - make sure no cables are in the props way before you do. Spin up slowly just until you feel the air blowing downwards, if it is blowing up then it is reversed or you have the wrong prop on the motor.

Hmm

(13-Aug-2023, 01:50 PM)Nigels Wrote: Hmm

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Hmm

Sorry about the above, I tried and failed to attach a video.
I'll try to describe it .
I tickle up the throttle and the whoop jumps up an inch rotates 90° round the z axis and switches off. The rear left rotor appears not to rotate. However under different circumstances it works well.
The difference circumstances are that I hold the whoop whilst arming it. The motors all rotate. If I tilt it around, I can feel it trying hard to maintain a horizontal position with all rotors. It does this in my settings of angle and horizontal mode, but it's a little bit weeker in acro mode.
By the way, thanks for your suggestions so far.
All the best

If it it takes off level and spins (yawing on z-axis) then that sounds very much like motor/prop direction issue.
Did you already check board orientation, motor ordering+direction, and prop orientation? All are ok?

If the MOTOR DIRECTION REVERSED is checked in the motors tab, this is props out orientation. This means the front two props spin out and away from the camera. The propellers rising edge on the blade should be in the direction it is spinning. So the front right propeller spins clockwise and the rising edge should be leading in the clockwise direction.
If MOTOR DIRECTION REVERSED is not checked, then props in, so all motors will spin in opposite direction. There is a diagram on the BF configurator to make it clear.

So looking on the bright side, I started with three separate pieces of gear. One of which, the mobula7 hd, is brand new.
Now I can see fpv through my tinygo goggles, albeit with little telemetry. My mob7 and t-lite bind automatically in Elrs on switch on. My sticks control all the right rotors (but in the wrong order! - British joke) and I have a response from the arming and rates settings I configured!
The question is; how do I best move forward from a jumping whoop?

Change your channel map if the sticks are wrong. So most, but not all, quads use either TAER or AETR (I said almost all, because LiteRadio2 SE uses some weird channel map like AERT). So you go on to Receiver tab and move each stick and note down which stick does what. Then change the channel map to reflect it. Save.

Can you get it to hover? If yes, go fly. If no, move to next problem.

When all is fixed, stick it in angle mode and go fly for 30 mins. Then fire up a sim and make sure the sim is in air/acro mode. So fly in the sim until you are fairly happy and then take your mob7 outside and fly it in acro. You should be aiming for 15-20 mins per day if you can. If you fly for 20 mins or more per day, you will be pretty good within a couple of months.

Hi Pathfinder
Our paths cross again!
You made some suggestions re. my TinyGo mods. Sadly the only thing you couldn't help with was my rubbish soldering technique! I decided to give that a rest and buy an off the shelf Mobula7 HD.
I wonder if I've bought a TAER version by mistake. In the system menu of my T-lite Tx it clearly says it's set on Mode 2 AETR, so it must be the Mobula7 that's wrong!
I'll follow your suggestions now.

So I went into receiver tab and found that all the sticks were properly in AETR format. However the pitch is reversed. Ie. Stick away - nose up. Stick back - nose down! All the others are ok.

You should be able to reverse it. I think I had to do it on a Literadio i was testing, but I can't remember how you do it on BetaFlight. :/ Looked it up, you have to use the rxrange command on BF. Better to fix it on the T-Lite, though. You need to invert the channel that isn't correct.

Sorry for the bad answer, im a bit sick at the minute.