Grage Aeromodelling

Oops!

Originally Posted by bartremes View Post
Hi miru,
The arduino pro mini 5V 16Mhz is communicating to the AR Drone with 5V while the TX and the RX pins from the drone measure 3.3V.
The drone is pulling so much current from the arduino that his 5V is dropping to 5.2V
somehow the ardrone is lucky to survive. But it would be better to put a voltage divider on the TX of the arduino.
kind regards microuav

Finally I had a chance to check this out, AND YOU ARE RIGHT, the Arduino is trying to pull the TX output to 5V and the drone clamps it to 3.3V. Therefore, we'll have to add a resistor on that line, I tried a series resistor and a voltage divider on the bench, both work, however the series resistor is easier to implement (just put it in the cable). I tested a 1K and a 10K series resistor on the bench, both worked, but I want to wait until I had a chance to test this setup in flight.... (think 1K is large enough, it reduces current on my setup from 65mA to 40mA and about 30mA is used by the RX).
miru

Originally Posted by text12 View Post
So is this now the official wiring for this mod? I don't want to take mine apart if this is just experimental
Yes this is the official wiring for the mod.
As to the value of the resistor, a 4K7 works very well in my setup. UFO-Doctor measured 20mA on that line without the resistor. With a 4K7 the current is (5V-(3.3V+0.7V))/4K7 = 0.21mA.

Budi wrote:Sip kalo gitu, oom Wawan....kabarin ya saya harus transfer berapa.......thx

GandrungMaBur wrote::tlt
Sambil nunggu Part datang (+/- satu minggu lagi), iseng ngebandingin Part yg akan tiba dari Sparkfun dengan gambar yg ada di RC Group Jadi Mumet nih
Di kotak hijau menunjukan perbedaan port antara Mini Arduino Pro yg di Forum dengan Parts di sparkfun.
(Forum/Sparkfun)
1. (GRN/BLK)
2. (TXO/GND)
3. (RXI/VCC)
4. (VCC/RXI)
5. (GND/TXO)
6. (BLK/GRN)

Apa hanya tinggal balik aja yah ?????? praktisnya begitu....
Mohon inputan dari para Suhu MC seantero Grage.( .. are not alone......Banyak suhu hebat disini)

Salam