One of the things that I am not happy with is the FreeRTOS implementation on the Arduino ESP32 library. I try to reserve core 1 for bit-banging and I have a nice average 4uS accuracy. But, I also have 110uS long iterations ca once per second as I activate WiFi. Also, I fail to activate…
While I am working on more permanent HMI solutions I need a CLI that communicate through USB that can initialize the ESP32 based designs. A CLI is a command line interface that act like a brute force interpreter. In theory we could implement a full Unix alike shell, but I only want a few commands…
The DPS5005 contains a USB/RS485 interface so both PSU’s can be remotely controlled. I want to use this option to create a Wifi based PSU. ESP-Wroom-32 do have 3 UART’s, so we can still keep UART0 for programming and use UART1 & 2 for each board. I do however notice on the original USB board…
Working with software is often long hours with invisible progress. In this case I worked on the Edit Control. I actually tried to use a standard Windows one, but decided to make my own from scratch. In effect it is only a few things I use from Qt including their interface to OpenGL. Edit Control…
This shows the assembled PSU. Only one of the DPS5005 modules are mounted as I am still waiting on the 2nd. You can see the driver stage mounted inside. The black painted front turned out quite nice. This is the back side with the mains connector, fuse and switch. I have to wait a few…
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…