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Calliope mini ESP8622 Wifi Module

This is a package for controlling an ESP8622 module to send messages from the Calliope mini. It can be used by the PXT Calliope mini editor. Should also work with PXT for Micro:bit.

⚠ The ESP8266 will need an external power supply capable of providing up to 300mA. If you try to directly use it with the Calliope mini, it will not connect and the Calliope mini resets due to too much power drawn.

Update Firmware! You may want to update the ESP with the latest firmware. The add-on requires at least v2.0 of the AT command firmware. You can find the firmware download link here: http://www.electrodragon.com/w/ESP8266_AT-Command_firmware under Espressif AT Commands Firmware.

Wiring the module

Calliope mini -> ESP8266 wiring

Testing

  • Modify tests.ts to send packages to your own server.
  • Execute two little servers: while(true); do nc -l -p 9090; sleep 1; done and nc -l -u -p 9091 (Linux, also echos the messages)
  • Compile the test pxt test and copy built/binary.hex to the Calliope mini.

On the USB console window you will see this:

TEST START
TEST: modem working: OK
TEST: disable echo: OK
TEST: modem identification: OK
TEST: AT version:1.3.0.0: OK
TEST: SDK version:2.0.0: OK
TEST: wifi set mode: OK
TEST: wifi mode: OK
TEST: wifi connect: OK
TEST: ip mode: OK
TEST: ip connect: OK
>>> (1)  
>>> (13) Recv 15 bytes
>>> (7) SEND OK
TEST: ip status: OK
TEST: ip close: OK
TEST: wifi disconnect: OK
TEST: network not found: OK
TEST: network attach: OK
TEST: TCP send: OK
TEST: UDP send: OK
TEST: network detached: OK
TEST: network attach: OK
TEST: message send: OK
TEST: network detached: OK
TEST FINISHED OK

You can follow the AT flow on the USB serial console by enabling debug in tests.ts

The server should show something like this:

while(true); do nc -l -p 9090; sleep 1; done                   
{"test":123456}{"test":123456}

Example

Blocks

Example Code

Javascript

modem.enableDebug(true)
esp8266.init(
    SerialPin.C17,
    SerialPin.C16,
    BaudRate.BaudRate115200
)
esp8266.attach(
    "ubirch",
    "mypassword"
)
esp8266.send(
    MessageType.TCP,
    "46.23.86.61",
    9090,
    "HELLO WE ARE CONNECTED!"
)

Meta

  • PXT/calliope
  • PXT/microbit

Depends on pxt-calliope-modem.

Author: Matthias L. Jugel (@thinkberg)

License

MIT