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There are many states in the US that now have closed non-essential businesses and there are more about to. I'm affected since I'm in one of those states, Pennsylvania. Although where I work manufactures plasma cutting tables for HVAC, an essential business, and supports these tables we are...

I just googled for a 555 vibration circuit and found https://www.electroschematics.com/6023/vibration-sensor-circuit/ . It uses a M74HC123 Monostable Multivibrator which is similar to the 555 and uses a piezo element for sensing vibrations. I haven't tried the circuit nor do I know if it can...

Thanks for the heads up. It looks like all the Teensy family is on Amazon from various sellers. The 3.2 is Amazon's choice item. I'll order one from Echotest because I just love ordering overpriced items that get delivered on the slow boat from China :). I usually get mine from MicroCenter since...

Looks like I'm in good company. I learned 6502 assembly at Penn State since they thought the 6502 was the future at the time :). I then learned Z80 on the ZX81 and returned to 6502 on the Commodore 64. In the 90's for a job assignment I was introduced to the Microchip microcontrollers and have...

Awesome! I was thinking of doing something similar but with life getting in the way I never got to it.

I haven't given it much thought since I've been dealing with family matters recently. I may go with a Z80 Emulator on chip. That would be easier. I am a programmer with an Electrical Engineering degree and programmed in Z80 ASM, microchip, C, and C#. So coding I'd be up to coding it as an ULA...

I have been entertaining the thought of using a Teensy 3.5 as a replacement for the custom ULA IC found in the ZX81 computer. The ZX81 used the control lines of the Z80 to do the video generation rather than using a dedicated video chip. This requires constant monitoring of these lines. I feel...

You can use the 5V power output to externally power a Teensy as mentioned in https://www.pjrc.com/teensy/external_power.html. If you want to connect the I/O pins of a Teensy to lines that use 5V you should use a 5 Volt tolerant Teensy such as the Teensy 3.5.

At least the dimensions of the Arcade machine. I don't have a CNC machine but I do have a friend that does have that and a laser cutter and uses Fusion 360 so those files would be great to have. Does the PCB board use a Teensy LC? I just bought a 3.5 to get into the Teensy. If you can show a...

Awesome setup!! Are you planning on posting plans? I have a 19" and 21" monitor taunting me to put them in an arcade cabinet.

All the devices you have connected must share a common ground otherwise the serial port will not communicate. Between all devices the cable should have 3 conductors, transmit, receive and ground. The ground must be connected to the ground of the devices on both ends of the cable.