Draw and Drill a MCP3008 circuit board

thingiverse

This is an example of what can be done with my experiment PCB Prusa Factory ( https://www.thingiverse.com/thing:2415508) 1) What is this board ? It is a Analog Voltage reader with 8 channels based on MCP3008 chip in SOIC format. It provides an easy way to connect 8 Analog Sensors, for each channel, 3 pins are designed to host 3pin dupont cables. These dupont cable are used to connect to the analog device, and provide : Ground, , Maximum voltage ( VREF) and the MCP3008 pin. There are 2 switches SW1 and SW2 which allows to decide to use the same 3,3V for digital voltage and for the VREF of sensors. Putting the SW1 and SW2 switches will use the 3.3V from the digital V to be sent to the sensors. if you want to use 5V sensors, do not put the SW1 and SW2 switches , and connect the Analog Voltage 5V to VREF, and Analog Ground to AGND. There are 4 pins to allow connection to a raspberry pi or arduino, using a 4 pins dupont cable. 2) Want to try to make this PCB with your printer ? 2.0 build the Tools to allow your printer to handle a pen and a drill motor with a drill bit. check my PrusaPCBFactory objects ( https://www.thingiverse.com/thing:2415508 ) and download the tool holders, so that it is easy to fix Tools to your printer without impatcing the printing feature. ( some design may be needed if you are not using a prusa emotiontech printer. ) 2.1 print the 3DPrint__Support-STD.gcode support file. this will print the support for the PCB. This support needs to remain in place on the bed of the printer, do not remove the support from the printer bed. Add some scotch to the support to ensure that it will not move at all. 2.2 Mount the pen tool and calibrate Launch the auto home feature. Normally, after autohome, the tool holder is outside of the printer bed, and it is then possible to mount a tool on the tool holder. Mount the pen tool on your printer ( if you used my holders, the pen tool simply slides on the tool holder). Use the move commands from the panel to move the tool to the edge of the Arrow of the support.The pen must touch precisely the edge of the Arrow. Note x,y,z values from the printer panel. Edit the Pen__copper_top_+_copper.gcode file with a text editor ( Notepad.exe) search between the lines ;CALIBRATION_START and ;CALIBRATION_END Modify the 3 lines G92 with the x,y,z values that you noted previously G92 X-46 G92 Y-53.4 G92 Z-21.8 be sure to leave the minus character : "G92 X-" and add the value after. Save the GCODE file. 2.3 cut a Copper clad with following size : Width :36,592002 Height :32,512 and install it on the support. Be carefull not to move the support ! 2.4 launch the modified gcode file on the printer Verify that the etch resist pen ( staedtler pen, nothing else ! ) moves correctly to draw the PCB. I recommend that you first test the gcode without the pen, to see how the printer moves, and verify that it looks ok. then check that the printer is drawing correctly the pcb on the copper. 2.5 etch the copper clad with etchant. 2.6 put the copper clad on the support 2.7 mount the Motor drill and calibrate motor drill, by puting the drill bit at the edge of the Arrow, noting x,y,z and updating the drill gcode file with the values 2.8 launch the drill gcode in test mode do not turn on the drill motor, and ensure that the drill motor can move freely on Z axis. then launch the drill gcode, and verify that the drill bit touches exactly where the holes should be. recalibrate if needed. then , fix the drill motor on z axis, and launch definitively the drill gcode file. this will drill each hole.