Search found 1461 matches

by Roberthh
Tue Jul 02, 2019 6:50 am
Forum: ESP8266 boards
Topic: Wemos D1 mini MP installation
Replies: 3
Views: 110

Re: Wemos D1 mini MP installation

I am running MP on a WEMOS D1 mini successfully. One thing that is common to all ESP8266 boards:
After power on, the ESP8266 sends some messages at 74880 Baud (115200 * 26 / 40). You can set Putty to that baud rate to see the messages. Maybe that tells you more.
by Roberthh
Tue Jul 02, 2019 6:18 am
Forum: micro:bit boards
Topic: Problems building micropython-1.9.2 from source
Replies: 8
Views: 5315

Re: Problems building micropython-1.9.2 from source

It seems that you did not install the tool chain or did not set PATH properly.

xtensa-lx106-elf-gcc: not found

Follow the instructions at <https://github.com/pfalcon/esp-open-sdk> carefully.
by Roberthh
Mon Jul 01, 2019 3:04 pm
Forum: ESP32 boards
Topic: [Solved] Cannot Build Latest using esp-idf 6b3da6b
Replies: 3
Views: 118

Re: Cannot Build Latest using esp-idf 6b3da6b

No issues here. Did you
- also update the tool package to xtensa-esp32-elf-gcc (crosstool-NG crosstool-ng-1.22.0-80-g6c4433a) 5.2.0?
- run git submodule update --init after checkou out esp-idf 6b3da6b (my favorite omission)?
by Roberthh
Sun Jun 30, 2019 12:01 pm
Forum: Pyboard D-series
Topic: using dfu-util to upgrade pyboard-d firmware
Replies: 2
Views: 157

Re: using dfu-util to upgrade pyboard-d firmware

e.g. sudo dfu-util --alt 0 -D PYBD_SF2_W4F2.dfu
File name to be changed for the various models
by Roberthh
Sat Jun 29, 2019 7:56 am
Forum: ESP8266 boards
Topic: Driver for NEMA 17 stepper motor ?
Replies: 15
Views: 456

Re: Driver for NEMA 17 stepper motor ?

I'm still irritated by you statement about the distance:
(i.e 500 to 1000 meters or above)
That is quite a number and requires solid construction work, with intermediate supports, solid belts and large engines, ... Clearly beyond of what is normally considered here. So are these numbers correct?
by Roberthh
Fri Jun 28, 2019 10:23 am
Forum: Drivers for External Components
Topic: xpt2046
Replies: 2
Views: 142

Re: xpt2046

I made a driver once for PyBoard, and now took your question to adapt & test it on ESP8266. Since it uses SPI for communication, it should be possible to adapt it. You can ignore T_RQ and pull TCS low. Then you need only TCLK = CLK, TDIN = MOSI, and TDO = MISO. Location: https://github.com/robert-hh...
by Roberthh
Thu Jun 27, 2019 8:35 pm
Forum: ESP8266 boards
Topic: Reading voltage through A0 pin
Replies: 6
Views: 192

Re: Reading voltage through A0 pin

Thank y lot. Actually the BME280 driver is just a port of the Adafruit driver. I invested some time to compare the calculations in the code with the original Bosch specifications and made a PR to adafruit for a change. The ADC of the ESP8266 is not very precise. Even the full range voltage varies be...
by Roberthh
Thu Jun 27, 2019 3:36 pm
Forum: ESP8266 boards
Topic: Reading voltage through A0 pin
Replies: 6
Views: 192

Re: Reading voltage through A0 pin

Looking at the schematics https://wiki.wemos.cc/_media/products:d1:sch_d1_mini_pro_v2.0.0.pdf, the board has a solder jumper SJ1, which connects the TP405x output internally via a 130k resistor. If that one is closed, and you have you rexternal 220k resistor too, then the resulting resistor is 81.7 ...
by Roberthh
Thu Jun 27, 2019 3:29 pm
Forum: ESP8266 boards
Topic: Reading voltage through A0 pin
Replies: 6
Views: 192

Re: Reading voltage through A0 pin

A fully charged 18650 Li-battery has a voltage of about 4.2V. What I do not understand from you post: did you add an additional 220k resistor between the TP4056 output and A0 (obsolete: ,or do you connect the output of the TP4056 directly to A0. In the latter case, it is no wonder that you always re...
by Roberthh
Thu Jun 27, 2019 5:39 am
Forum: ESP8266 boards
Topic: Comunicación de cliente-servidor con 2 esp8266
Replies: 2
Views: 127

Re: Comunicación de cliente-servidor con 2 esp8266

Using the network, you can follow the usual methods, as nicely explained e.g. in https://realpython.com/python-sockets/