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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 (Ā±20g and Ā±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.
Bottom side of the StarPointer virtual electronic finderscope.
All the details of this project are available at jayakody2000lk.blogspot.com/2022/06/virtual-electronic-fi...
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.
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.
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
I heard that this was a good lens but it had two fatal flaws. It is a Canon EF-M mount lens (instead of Sony E mount) and it has autofocus. This particular sample had been dropped by its prior owner which is why it stopped working. Like most modern lenses it uses focus by wire to manual focus. I've converted the focus by wire ring to a manual focus ring. Once the epoxy has cured I will test its focus on the Nex 6 before making a mount for it.
Homemade PCB for tennis ball machine. This circuit will drive the two propulsion motors.
Made with toner transfer method using an iron, PulsarFX transfer paper, and Green TRF. It took a lot of practice to get the tonner transfer right. I first had to figure out that my iron was too hot, then I experimented with the pressure. I ended up standing on the iron to apply my full 175lb weight, 4 times, each 30 seconds, rotating between. Then I rolled the iron and board over a small rolling pin twice. I didn't get the Green TRF working as well, but I didn't have as much time to experiment.
This is a 1oz board, and I tinned it at the end with Liquid Tin.
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.
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.
All the modules for the new setup 2009 to capture insects in flight are now ready. Just a few software adjusts now.
Seen Here: The PCB all soldered, except the ICSP header (forgot that...)
So, today my PCB for the LED matrix arrived from BatchPCB! For what I paid, the PCB arrived fairly quickly - I ordered it on the 15/02 I believe, and it arrived 11/03 -- 26 days, which is pretty good (they state 19 business days).
The quality is very, very impressive - far better than anything I could pull off at home. The silkscreen and soldermask makes it look really nice, too.
Soldering it was a joy, although there was a LOT to solder and it's all surface mounted.
I had a few problems at first; it wasn't lighting the matrix at all properly but I soon realised with my new design (transistors on the cathodes) I have to write the transistors HIGH to get a LOW on the cathode, so a quick line of code changed to get that working.
Then for some reason the top half of every letter was flipped. It turns out this was my fault: I messed up when making the package for the LED matrix in Eagle, swapping the matrix's 5th cathode for my system's 8th, 6th for 7th, 7th for 6th and 8th for 5th. This was fairly easy to fix in code, however.
Finally USB isn't working to program or communicate, but I can configure the FT232RL chip (after all, it's sending the clock pulse that's driving my ATmega168). I think I have an idea of what's causing this, but I'm not sure yet.