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Thanks for that info suvsuv. The problem I can see is going to be sourcing 1x AO3409!
Group buy anyone! ;-P I'm going to keep using 8x 1.2V NiMh... (EDIT: digikey has them for 57c... minQ=1 but at that price probably best to buy a handful just incase you have soldering difficulties I guess. I bet shipping kills the deal though.) |
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Last edited by thwaitm; Jan 17, 2013 at 07:12 AM.
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You don't need to worry too much if you are well prepared with replaced components. The chance is there but not very high. BTW, other than the capacitor and the MOSFET, a 1 Ohm safeguard-resistor, marked with red arrow in attached image, is most likely damaged as well. But this resistor is easily replaced with a short piece of wire. |
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Last edited by suvsuv; Jan 17, 2013 at 08:05 AM.
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We talked about this transistor some time ago in this thread. Really I don't rely on the way that Walkera works to power On and Off the transmitters, so:
I use a 3S Lipo on the Devo7 transmitter and I low the voltage with two diodes connected in serial. The Devo7 hasn't a software configuration to indicate the value of voltage to start beeping and disconnect, so with this two diodes I have an indication in the LCD with battery discharged around 10.5 volts. Lipo is different in the discharge curve and the transmitter doesn't cut automatically but in the LCD I can see that the voltage is low and the Lipo needs to be recharged. I don't rely on Walkera so I have one switch that allows me to physically cut off the power in the transmitter (the Walkera switch works fine but I don't rely on it). Lipo batteries shouldn't be fully discharged if the transmitter fails in powering off (I have read that if you fully discharge them, then they could ignite). |
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Last edited by Tripert; Jan 18, 2013 at 07:38 AM.
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I have a question about reversing the pitch in a model file. I posted it on the Deviation forum, my first time there, but don't know if its monitored as close as here. I see some with zero replies. I'm still figuring out what goes where in these forums. Thanks guys.
http://www.deviationtx.com/forum/model-configs |
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hello to all!
can i add some switches to Devo7E? i look to code, deviation / src / target / devo7e / capabilities.h and deviation / src / target / devo7e / channels.c in to a CHAN_ReadRawInput() function. may be need some changes in Init procedure. the question is - in a hardware it`s a big trouble to add some wires? need good lense to solder wires to a CPU chip? can i look to a inside photos? else, i have an idea add Devo protocol to orange dsm module. need fly v120d02s, my project change RX2636HV-D to copterX 3x1000 and spektrum receiver is failed. using CYRF and PSoC from orange 6 ch receiver failed, too slow CPU. |
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Assuming you have the skills to attach a wire to an LFQP package, the main problem you'll have will be finding an available pin, since the 64PIN MCU is pretty thoroughly used. You can cross-refernece the pinout here: http://www.deviationtx.com/articles/...re-connections to the image I've provided, though that list isn't 100% complete. I believe each switch has one terminal connected to ground and the other to the MCU. there may be some protection on the pins too, I don't recall. Code wise, it is basicallyas you say: add the right initialization and change CHAN_ReadRawInput() You need to update capabilities.h as well. Note that we've determined the 7e has its power-amplifier disabled for transmit, so max power is ~7mW without a hardware mod to re-enable the PA. |
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sanks. pin step on MCU is small enough, but with a some Russian`s words and vodka soldering may be success. a drop of glue on a finish.
in a photo you have complete PA modification? you use another module? or what? details, please. add: can i use SWDIO, SWCLK as GPIO for additional switches? |
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Last edited by RW9UAO; Jan 22, 2013 at 09:37 AM.
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I have not done the power-amp mod yet. You can find more info about it in the 7e thread on deviationtx: http://www.deviationtx.com/forum/7-d...work?start=124 There appear to be 2 options: 1) remove the shield and short out a diode to enable the power-amp 2) remove the existing module and replace it with the '8s' module |
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Re soldering to tiny chips
I've had good experiences using conductive (silver) paint to attach to tiny chip legs without the danger of trying to solder....
1) place a small blob of paint on the top of the chip. 2) Tack or CA your wire in situ and paint the stripped end of the wire to the blob of paint on top of the chip, and wait for the paint to dry. 3) paint a trace from this inital pad to the the required chip pin . 4) CA or epoxy the wire and paint in place so it is solidly held (after checking conductivity is good) If you get it wrong or connect to multiple pins the paint can be chipped of with a scalpel quite easily, and I've never had a problem with long term reliability. The silver paint I've used is pretty expensive (£10 for 1ml) but you can make your own conductive glue by mixing lots of powdered graphite into almost any glue. I've never tried this and I've read it does have a small resistance but should work fine in this application .... assuming you can make the glue thin enough to paint a fine enough line with. As with all things ... do a couple of test runs on old junk boards before attempting it on your DEVO. |
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