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...with a grill!
I needed to try out my solder paste and wanted to reflow solder these parts, especially the tricky switch and SD card which would be a pain to solder by hand. I don't have an IR oven or a hot plate (or a reflow machine!) but I do have a standard home grill and figured it would be perfect: the fan moves the air, keeping everything the same temperature while the heating elements are overhead and far away enough to heat uniformly over the surface.
It took 5 minutes from turning on until every joint had reflowed (they started reflowing at 4min) and then I left them for a minute out of the grill to cool down. They seem to have soldered perfectly!
I'm still waiting for the parts for the other two PCBs, but the method seems to be great - and loads quicker than doing it by hand!
P.S. yea, it's not a very well regulated temperature, but I don't have a thermometer that could cope so it's pretty difficult to measure
It's the biggest printed circuit board that I've ever built. Well, technically it's eight boards... but each of THOSE alone would still be the biggest that I've ever done-- if you don't count the whole set together.
Read more about the interactive LED coffee tables here
The PCB for M2FC, Martlet 2's flight computer.
The flight computer features three K-type thermocouple inputs, three strain gauge half-bridge inputs, three 1A pyrotechnic outputs, a full IMU (±20g and ±200g 3axis accelerometers, 3axis gyro and magno, barometric pressure), a micro SD card for datalogging and a serial interface to the radio and other peripherals. It's powered by an STM32F405VGT7 32-bit ARM microcontroller.
For more details on the schematics, see: www.cusf.co.uk/2014/07/martlet-2-electronics-schematics/
The PCBs were kindly sponsored by Cambridge Circuit company, thank you!
Fischertechnik pcb.
The first series of PCBs ready for drilling. To start, there is a PCB for 8 fischertechnik 9V motors with possible expansion to 64 motors. The drivers used are the TB6612, PWM signals are also multiplexed 8x8 max, PWM resolution 1 usec, periode 128 usec or 8 KHz, the directions bits are driven via an SPI line to reduce the number of outputs, refresch rate 1 msec.
Up to 64 servos can be used. They are multiplexed by 8 groeps and 8 servos/groep.
There is a board for different sensors, max 48 sensors/board. Hal sensors, opto sensor, proximity sensor, and rotary encoders.
There can also be dual 7 segment display used.
The following PCB series is for the FPGA module, power supplies and distributed printing.
D100 shutter controller PCB.
TSL208R 512 pixels line sensor module to capture insects at night (moths).
Ready to assemble the components.
This is a closeup of the "DSi Layers" image, showing what's under the NAND flash chip. This is a 256MB eMMC (embedded MMC) memory chip, with a JEDEC standard pinout. The DSi is using it in 4-bit mode, and all of the data signals are available either on nearby components or vias.
This is the sensor pcb module. An AVR controller ATtiny45 take 50.000 ADC samples/sec and give the results to the CPLD module. Into 40 usec detection from a fast flying insect in focus is possible. This module commes into the AF200/4Dmicro lens from Nikon. Only insects in focus give a signal output to the CPLD module.
Highpower controller for UV leds to capture insects in flight into the full dark. Frequence control and power is done via the AVR ATtiny26 controller. Insects like pulsed UV light. I can change the frequence of the lights between 50Hz and 1Khz. Normal 170 Hz is used. The UV lights are highpower at 400 nm and need 1.4A current/led. 2 UV leds and 2 withe leds are used.
Homemade PCB for tennis ball machine. This circuit will drive the two propulsion motors. You're looking at the component side of the board with a "silk screen" graphic showing the components
Detailed view of Aurora Open Source Mixer PCB. This section shows a labeled description of IC function.
Borrowed this along with a Sony HandiCam with HDMI outputs to test an HD-SDI receiver circuit.
IMG_20140207_201833
Camera: Canon EOS 40D
Exposure: 8 sec (8)
Aperture: f/10
Focal Length: 70 mm
ISO Speed: 100
Exposure Bias: 0 EV
Flash: Flash did not fire
pcb I always thinking about making something out of PCB, which is the base of most of the computers we use today.Taiwanese manufacturers design and produce most of the PCBs today.
Plain Graham - after being colored with the spray food coloring. You can imagine variations on this theme where you put down traces (pretzel sticks?) before spraying the green stuff, to mask true printed layers on the board.
Part of the circuitry snacks project: Edible models of functioning electronic circuits. Designed for fun, for geeks, for kids, and for teaching and learning electronics.