I showed the MOSFET driven resistor array earlier and while searching for digital potentiometers I found 2 that are SPI based on 10K. One is the MCP41010 with 255 steps, but the one I really liked is the new AD5231 with 1024 steps. They exist in 10K, 50K and 100K versions and provide a far…
I started to mechanically assemble the 4 channel 3KW controller. One note is that 2mm wire is easy to work with, while 3mm wire is very hard to get right. In fact, to assemble this it might be better to design with 2x 2mm wires than using a 3mm. I have not started with components…
Assuming I create one Hat with AD9851 and a second with an analogue, programmable PSU and a 3rd with an amplifier this project suddenly becomes very realistic. I doubt that I can get all I need on one Hat and an analogue low noise +/- 24V PSU is actually so awesome that I would…
This weird circuit is a programmable, analogue PSU. It is basically only a LM317 and an array with resistors and MOSFET’s so I can program the voltage out by selecting a combination of 10 resistors. This is not straight forward, but I can at least Select 10 preset values. In addition I use an ADC…
I need a function generator and I like AD9851. What I really would like is a Function Generator Hat with programmable +/- voltage like the diagram below: This is not impossible, but the DDS, Amplifier and Programmable PSU on a small Hat is not realistic. Or – well – I need to think about that…
This is the backside of the 30V x 20A Motor Driver and the red lines are the main power paths. The lower left one is the + path, while the top, angeled is GND. The later will be merged into ground plane so it get a bit extra help. But, these are the paths I…
The first draft of rev 1.1 of 30V 20A Motor Driver. The differences are that I replaced the DC/DC with a 78M12 (linear regulator) for simplicity and cost, replaced INA210 with INA193/INA194/INA195, added 2 temperature sensor on-board and replaced connectors with te smaller JST Micro connectors. I also combined 3 connectors to one. I also…
This is an early beta of the HMI Designer. The idea is that you draw your HMI displays, save them as XML and then send them to a HMI Browser. The Browser will execute the graphics and send back user events allowing a system with no knowledge of HMI, how or what to make use…
This was my first project that got me started on electronics again. The initial design did not work at all. It used an STM32 on one side and ESP-03 on the other which created too much interference + I had selected the wrong type H-Drive. The MCU and PSU design did however work well and…
This diagram illustrate the HMI solution the way I am planning it. I would like one external RS485/UART so I can attach the display to any embedded solution. CAN, USB and SPI Backbone is mandatory. And I think SPI Half Duplex will do fine over max ca 50cm that we talk about here. SPI is…