Search found 1398 matches

by Roberthh
Sat Jun 15, 2019 4:55 pm
Forum: Other Boards
Topic: [Black STM32F407VET6] Pin map
Replies: 8
Views: 119

Re: [Black STM32F407VET6] Pin map

Then most likely the LED anode is connected to Vdd, such that it requires a low level to shine.
by Roberthh
Fri Jun 14, 2019 7:54 am
Forum: ESP8266 boards
Topic: How to manually awake from deep sleep
Replies: 4
Views: 191

Re: How to manually awake from deep sleep

Yes. The pin also has an internal pull-up, and adding a capacitor between the reset input and GND parallel to the switch reduces bouncing. Value about 100 nF
by Roberthh
Fri Jun 14, 2019 6:09 am
Forum: ESP8266 boards
Topic: How to manually awake from deep sleep
Replies: 4
Views: 191

Re: How to manually awake from deep sleep

How about just forcing reset with a button? If that happens only rarely, the few seconds required to boot seem acceptable.
by Roberthh
Thu Jun 13, 2019 3:42 pm
Forum: ESP8266 boards
Topic: Startup serial noise?
Replies: 2
Views: 161

Re: Startup serial noise?

The serial noise is a boot message sent at 74880 baud. Something like " ets Jan 8 2013,rst cause:2, boot mode:(1,6)" and so on, much like the message you showed above.
As soon as MicroPython initializes, the baud rate is set to 115200.
by Roberthh
Thu Jun 13, 2019 12:24 pm
Forum: General Discussion and Questions
Topic: Increase Console Scrollback
Replies: 4
Views: 90

Re: Increase Console Scrollback

Yes, I think so. I could not see any dynamic means in the code.
by Roberthh
Thu Jun 13, 2019 12:11 pm
Forum: General Discussion and Questions
Topic: Increase Console Scrollback
Replies: 4
Views: 90

Re: Increase Console Scrollback

By the size of of the array readline_hist[] in the port specific mpconfigport.h.
by Roberthh
Wed Jun 12, 2019 3:45 pm
Forum: ESP8266 boards
Topic: ADC voltage range
Replies: 3
Views: 116

Re: ADC voltage range

The answer to the first question is unclear. Having never fried an ESP8266 analog input and having seen not complaints from other users, the answer is: most likely it is not critical to apply 3.3V to the analog input. You can find some comments in the net about the digital IOs of the ESP8266 being s...
by Roberthh
Wed Jun 12, 2019 6:50 am
Forum: ESP8266 boards
Topic: ADC voltage range
Replies: 3
Views: 116

Re: ADC voltage range

A suitable voltage divider consist of just two resistors in the ratio 1:2.2, like 100kOhm and 220 kOhm. 100k between GND and ADC in, and 220k between ADC in and your new ADC input. You can add a small capacitor of about 1 nF between ADC in and GND too, parallel to the 100k resistor, which will reduc...
by Roberthh
Tue Jun 11, 2019 10:06 am
Forum: Other Boards
Topic: [STM32H7/Linux] Can micropython be installed with linux OS on this microcontroller ?
Replies: 2
Views: 90

Re: [STM32H7/Linux] Can micropython be installed with linux OS on this microcontroller ?

Since there is a Linux port, the question is more, whether Linux is available for your Micro. You will have to re-compile the Linux Port of Micropython for your target platform. There was some discussion about compiling it for Raspberry Pi/Raspbian. You may find traces of that also in the Github rep...
by Roberthh
Mon Jun 10, 2019 5:53 am
Forum: ESP8266 boards
Topic: LCD 1602 - Library
Replies: 42
Views: 17865

Re: LCD 1602 - Library

The instantiation of lcd should be:

lcd=I2cLcd(i2c, 0x27, 2, 16)

or

lcd=I2cLcd(i2c, 39, 2, 16)

You screen dump shows 0*27, which is 0