Search found 107 matches

by Archibald
Tue Sep 11, 2018 3:02 am
Forum: General Discussion
Topic: ESP32 AnalogRead()
Replies: 3
Views: 9890

Re: ESP32 AnalogRead()

What do you have connected to pin 36?
by Archibald
Tue Aug 21, 2018 7:21 am
Forum: General Discussion
Topic: ESP32 of GPIO
Replies: 1
Views: 1185

Re: ESP32 of GPIO

From the datasheet section 5.3, pull-up resistance is typically 45kΩ. Minumum and maximum values are not specified.

By connecting a resistor to ground and measuring the voltage, I am measuring a pull-up resistance of 23kΩ but that is just for one pin on one ESP32.
by Archibald
Mon Aug 20, 2018 9:43 am
Forum: General Discussion
Topic: I2C Busy Timeout and wedged I2C Bus
Replies: 6
Views: 3820

Re: I2C Busy Timeout and wedged I2C Bus

There have been many reports of problems with I²C failing.

There's an alternative Arduino-ESP32 'Wire' library here that is supposed to be better:
https://github.com/stickbreaker/arduino ... aries/Wire
by Archibald
Sat Aug 18, 2018 7:55 am
Forum: ESP32 Arduino
Topic: What's the advantage of SigmaDelta?
Replies: 9
Views: 6106

Re: What's the advantage of SigmaDelta?

Hi Human, You asked how to do sinusoidal with ESP32 :) . PWM and sigma-delta are digital signals so you need to filter them to get an analogue signal. Using a DAC is very much better but you have only two channels available. The output from a DAC includes some unwanted signal components because the ...
by Archibald
Fri Aug 17, 2018 2:58 pm
Forum: ESP32 Arduino
Topic: What's the advantage of SigmaDelta?
Replies: 9
Views: 6106

Re: What's the advantage of SigmaDelta?

Can you tell me how to do sinusoidal with ESP32? You can include proper ESP32 code in your Arduino code. This code generates a sinusoidal waveform from one of the digital to analogue converters . . . . . extern "C" { #include "dac.h" } float theta; void setup() { dac_output_enable(DAC_CHANNEL_1); /...
by Archibald
Wed Aug 15, 2018 12:06 pm
Forum: ESP32 Arduino
Topic: ESP-Wrover-Kit pin names in Arduino
Replies: 5
Views: 3831

Re: ESP-Wrover-Kit pin names in Arduino

As documented here , pins 34 to 39 can only be set as input mode and do not have software pullup or pulldown functions. Also pins 6-11 are used for the SPI flash memory. Pin 0 (zero) is used by the 'Boot' button. Furthermore from this documentation of the Wrover: "GPIO16 and GPIO17 are used as the C...
by Archibald
Wed Aug 15, 2018 2:51 am
Forum: ESP32 Arduino
Topic: ESP-Wrover-Kit pin names in Arduino
Replies: 5
Views: 3831

Re: ESP-Wrover-Kit pin names in Arduino

I'm using a different kit but simply use the pin numbers in Arduino code, for example:

Code: Select all

pinMode(32,OUTPUT)
digitalWrite(32,LOW);
;
by Archibald
Wed Aug 15, 2018 2:41 am
Forum: General Discussion
Topic: Power amplifier/operational amplifier in ESP32
Replies: 6
Views: 4821

Re: Power amplifier/operational amplifier in ESP32

I ordered a TI LNA for my water/air pressure sensor but it is appealing to use the built-in amp. If your pressure sensor has a Wheatstone bridge configuration and is insensitive, consider using the HX711 "24-Bit Analog-to-Digital Converter (ADC) for Weigh Scales". It's available as a chip, or as a ...
by Archibald
Mon Aug 06, 2018 2:23 pm
Forum: ESP32 Arduino
Topic: How can I pass a value from Arduino C To HTML?
Replies: 11
Views: 9090

Re: How can I pass a value from Arduino C To HTML?

Hi Herbie, I am pleased that you are now seeing the temperature displayed on your web page. The function server.send_P is for when you have pointers to 'char' arrays. I don't have much expertise in this area, but I see the constructor for your server object can also take two parameters: an IP addres...
by Archibald
Mon Aug 06, 2018 2:03 am
Forum: ESP32 Arduino
Topic: How can I pass a value from Arduino C To HTML?
Replies: 11
Views: 9090

Re: How can I pass a value from Arduino C To HTML?

I'm not familiar with the server library and have not looked at all your code in detail, but I think you need to use server.send, not server.send_P. Does that work?

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