Search found 47 matches

by rodmcm
Tue Sep 29, 2020 2:03 am
Forum: ESP32 Arduino
Topic: Modbus Master Serial RTU without RS485
Replies: 5
Views: 503

Re: Modbus Master Serial RTU without RS485

send null characters
by rodmcm
Mon Sep 28, 2020 1:17 am
Forum: ESP32 Arduino
Topic: Problems when connecting 3 touch sensors.
Replies: 1
Views: 294

Re: Problems when connecting 3 touch sensors.

Your touchInterrupt T0 and T3 are both assigned to 15
Touch 0 = IO 4
Touch 1 = IO 00 ( may not be available)
Touch 2 = IO 2
Touch 3 = IO 15
Touch 4 = IO 13
Touch 5 = IO 12
Touch 6 = IO 14
Touch 7 = IO 27
Touch 8 = IO 33
Touch 9 = IO 32
by rodmcm
Mon Sep 28, 2020 1:05 am
Forum: ESP32 Arduino
Topic: Modbus Master Serial RTU without RS485
Replies: 5
Views: 503

Re: Modbus Master Serial RTU without RS485

Use something like Baseblock ComTest Pro to sample the messages on a PC http://www.baseblock.com/
You will need to connect with FTD module od similar
by rodmcm
Tue Aug 25, 2020 5:25 am
Forum: ESP32 Arduino
Topic: Large File Transfer via Bluetooth Classic to ESP32
Replies: 2
Views: 298

Re: Large File Transfer via Bluetooth Classic to ESP32

Second version of spread sheet, shows about 100K bytes/second transfer
BT Byte Send.xlsx
(11.16 KiB) Downloaded 24 times
by rodmcm
Tue Aug 25, 2020 5:18 am
Forum: ESP32 Arduino
Topic: Large File Transfer via Bluetooth Classic to ESP32
Replies: 2
Views: 298

Re: Large File Transfer via Bluetooth Classic to ESP32

Most of my BT classic is limited to low numbers of bytes so I thought that I would try larger transfers. This is the result of Bytes sent from an APP to an ESP32 using classic bluetooth, no delays introduced The bytes are send via an array which I populated with the same character. At the end of the...
by rodmcm
Sat Aug 22, 2020 10:14 pm
Forum: ESP32 Arduino
Topic: Frequency Measurement on digital input
Replies: 18
Views: 14977

Re: Frequency Measurement on digital input

II was really trying to understand what part of the interrupt caused the count delay but I didn't get to the high frequency input limitation. Except for the port call there is not much difference between your and my code... As to your frequency meter I don't have an LCD and was going to adjust your ...
by rodmcm
Fri Aug 21, 2020 9:23 pm
Forum: ESP32 Arduino
Topic: Frequency Measurement on digital input
Replies: 18
Views: 14977

Re: Frequency Measurement on digital input

Thanks for that
I tried your code against my original and didn't really see any difference in accuracy or stability. Can you explain what you saw with your code please.
by rodmcm
Wed Nov 20, 2019 7:19 pm
Forum: ESP32 Arduino
Topic: Analog Read Accuracy
Replies: 4
Views: 2380

Re: Analog Read Accuracy

Search this on UTUBE
He gives a polynomial to linearise the analogs..
The best series of tutorials on the ESP32 I have come across


Tech Note 069 - Using the ESP32 ADC and some of its more advanced functions

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