I recently bought a DPS5005 which is a 5A variant of the larger 20A DSP5020 I wrote about earlier. This module can deliver 0-50V/0-5A and have all the electronics inside the display module. Testing of this proves to be very good and it’s a good match for the 36V/5A driver module. As it all also…
This little example demonstrate how simple it is to create a Servo using the build in LED PWM. ESP32 comes with 16 channels of PWM, so in setup we asscociate channel 0 with pin 14 and set pin 14 to OUTPUT. We also set channel 0 to 50Hz 16 bit PWM. The example will sweep…
ExpressIF implemented FreeRTOS with their Arduino IDE library, so by using this we get a lot for free. By default we run Wifi etc on core 0, while the classic Arduino loop() run’s on core 1. In my case I want to use core 1 for bit banging and that is straight forward to program…
It’s time to code up the ESP32 Utility Driver. I am not that found of Arduino IDE, but it works and I like the wire library concept and how it simplify things. A Servo port is a signal that send a 50Hz pulse. The technique I suggest is a bit-banger where we loop as fast…
This ESP32 based Utility driver is just awesome in what it can do. I have to make a Rev 1.1, but for most parts it worked “as is” 7 x PWM Signals 0,5A each. CH340G UART to USB. ESP32 WROOM. 12 x Servo or IO ports. 12V PSU Input. USB. 2 x H-Bride for DC…
Finally received the PCB for the Train Control System and the Utility Driver. I decided to solder the Utility driver because that has the CG340G USB connection. Soldered the PSU & CG340 was straight up. I am actually impressed by CH340G as it always work and connect to Windows. Soldering ESP32 was straight forward, but…
The LMR14206 ripple was a bit much for my taste. It worked, I had 12V out, 3V3 out and the MCU ticked. But, it’s not a design I can live with. For now I continue on a different board and avoid mounting the DC/DC because I also realized that I could not really bypass it…
LMR14206 with 12V output to a LM1117 3.3V regulator. This is the 3.3V – 350mV ripple – not good. I need to work on that a bit. This is from my Motor Controller with MCU ticking. I probably need to add another coil on the 3.3V, but that add a lot of space, so I…
This is my LMR14206 DC/DC regulator with R1=15K and R2=1K which gives 12.2V out. The white wire is the PCB error I wrote about earlier. This is basically only the reference diagram – just be aware that the datasheet and demo schemtics mess up R1/R2 a little. Myself I use E values, so by setting…
I finally got around to assemble my 3V3 DC/DC converter and it did not work. Somehow I have switched off all checks in the EDA and managed to send it out like this – notice pin 6 is not connected … Luckily this is the first time I stepped into a bug in the PCB.…