HW-0.22-mini

After unpacking you will have to break the pcbs apart. be carefull not to bend the small part of the gyro pcbs.

Blank Boards

fc-board topside empty fc-board bottomside empty

Soldering the Accelerometer

The Lis3l accelerometer comes in a case with the contacts on the bottom side. You need hot-air tools to solder it.

fc-board with the accelerometer soldered

Since it is hard to desolder when the board is populated completely, you may want to test it before that. If you have an old (HW-0.21 oder HW-0.22) FC, you can connect it to that board. The pictures below highlight the pads where the specific signals for testing can be connected

3v3 pads to test the acc gnd pads to test the acc

MISO pads to test the acc MOSI pads to test the acc

SCK pads to test the acc CS pads to test the acc

DRDY pads to test the acc

FC board with connector for testing the acc

FC board connected to an old fc for testing the acc

Multipin-parts

Once the acc has been tested successfully, you can continue with the other parts. Its helpful to start with the big ICs with many pins, since it will be hard to reach them later. Do not solder the air pressure sensor until the very end.

fc-board topside with multipin-ICs soldered fc-board bottomside with multipin-ICs soldered

Twopin-parts

Continue with the smaller stuff, 0603 resistors and capacitors. Don't solder C55 yet, it will be hard to reach the parts of the air pressure sensor if it is soldered earlier.

fc-board topside with multipin-ICs and small stuff soldered fc-board bottomside with multipin-ICs and small stuff soldered

Connectors

You can then solder the connectors. Be carefull with the pico-blade connectors not to create any short-circuits.

fc-board topside with multipin-ICs, small stuff and connectors soldered fc-board bottomside with multipin-ICs, small stuff and connectors soldered

You can then do another test. use a laboratory power supply, set it to 5.5V and 100mA, and connect it to the output-pins where the PTH will be soldered later. The board should not consume much more than 100mA this way, I measured 60mA for mine. Check if all voltage regulators output the correct voltages (IC3 3.3V and IC4 5V).

Everything else

You can then solder everything else (except the gyro-breakouts and the air pressure sensor). For the large electrolytic capacitor C5, you will need to apply much heat, either with a powerful iron or by setting your iron to a higher temperature. I had to set my 60W iron to 450°C to heat the large copper traces on the board enough to make a connection.

fc-board topside with nearly everything soldered fc-board bottomside with nearly everything soldered

You can then, apply power via a laboratory power supply to the battery-connector. The terminal in the middle of the connector is the positive one, both others are ground. Set your psu to 9V, 200mA. Again, I measured 60mA. You can then flash the ngos and verify that the lpc runs and all hardware (acc, gyro, adcs) is found.

Breakouts and air pressure sensor

You can then solder the gyro-breakouts. It is enough to solder the fice pads on the top side at first. You can then, again, power up your mini-ng and verify that the newly connected gyros are found. If they are, you can solder the other edges of the gyro-breakouts and the air pressure sensor and C55.

fc-board topside with everything soldered fc-board bottomside with everything soldered

HIGH resolution images

click on the images below to get high resolution images ( /!\ large, 6MB each)

fc-board topside with nearly everything soldered fc-board bottomside with nearly everything soldered

Documentation/Construction/HW-0.22-mini/Soldering/FlightControl (last edited 2012-01-30 00:41:10 by AmirGuindehi)