IO0 / EN minimum/maximulm timing
Posted: Thu Jun 03, 2021 9:29 pm
Hello,
I have developed a board based on ESP-WROOM-32, whose objective is to be inserted in a box to measure the control surface deflection for RC planes and gliders. The system works with two boxes connected by Wifi (one of the boxes being AP and the other station) and a web app embedded in the AP box allows to display the deflections and gaps between two identical control surfaces. The project is in open source and is described at the following address (schematic, gerber and stl for the box): https://github.com/adesandr/GliderThrow_Meter.
I just have a small problem: the card does not reset itself on power on, I have to press the reset button to reset. By reading the forums and datasheets, I have the impression that my problem comes from the timing between the 3,3V and the rising edge on the EN pin. I put the RC circuit indicated on EN (R=10k and C = 0,1uF)
I have not yet put an oscilloscope, but I can't find in the datasheet of expressif the timing (min, max) between the establishment of the 3,3v and the rising edge on the EN pin, so that EN is correctly taken into account.
Here is the schematic of my board. Thank you very much in advance for the time you will spend to help me.
Regards.
I have developed a board based on ESP-WROOM-32, whose objective is to be inserted in a box to measure the control surface deflection for RC planes and gliders. The system works with two boxes connected by Wifi (one of the boxes being AP and the other station) and a web app embedded in the AP box allows to display the deflections and gaps between two identical control surfaces. The project is in open source and is described at the following address (schematic, gerber and stl for the box): https://github.com/adesandr/GliderThrow_Meter.
I just have a small problem: the card does not reset itself on power on, I have to press the reset button to reset. By reading the forums and datasheets, I have the impression that my problem comes from the timing between the 3,3V and the rising edge on the EN pin. I put the RC circuit indicated on EN (R=10k and C = 0,1uF)
I have not yet put an oscilloscope, but I can't find in the datasheet of expressif the timing (min, max) between the establishment of the 3,3v and the rising edge on the EN pin, so that EN is correctly taken into account.
Here is the schematic of my board. Thank you very much in advance for the time you will spend to help me.
- schematic.PNG (490.22 KiB) Viewed 5030 times
- pcb-v0.png (422.75 KiB) Viewed 5030 times