Cryptoticker for ESP32-C3 RISC-V

This is cryptoticker project for ESP32-C3 RISC-V eng sample.

It shows the (live updated) price of Bitcoin (in USD), data source: Bitfinex websocket API.

Based on esp-idf (tested with v4.3-beta1) and hacked version of esp-idf-lib for ESP32-C3 (just MAX7219 library is used in this project).

Here is youtube video showing the build / flash process and also the ticker itself.

How to build the ticker

Hardware Required

• ESP32-C3
• MAX7219 8-digit LED display (like https://www.aliexpress.com/item/1005001572247130.html)
• 5 wires

Hardware setup

ESP32-C3 GPIO	Display pin
+5V	Vcc
GND	GND
7	DIN
10	CS
6	CLK

Software setup

• install esp-idf from espressif github - see https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/index.html#installation-step-by-step how to do that (tested with v4.3-beta1)
• clone https://github.com/BugerDread/esp-idf-lib/tree/esp32-c3-hack

git clone --branch esp32-c3-hack https://github.com/BugerDread/esp-idf-lib.git

• clone this repository

git clone https://github.com/BugerDread/cryptoticker-esp32-c3

• open cryptoticker-esp32-c3/CMakeLists.txt and modify following line - the second path needs to point to "components" directory of esp-idf-lib you cloned in 2nd step (see Readme of the esp-idf-lib for details):

set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common ~/projects/esp32-c3/esp-idf-lib/components)

for example if you have esp-idf-lib in ~/somepath/esp-idf-lib, change it to:

set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common ~/somepath/esp-idf-lib/components)

Build and Flash

• move into "esp-idf" directory and run following (please note the dot and the space, they are IMPORTANT)

. export.sh

• move into "cryptoticker-esp32-c3" directory and run following

idf.py set-target esp32c3
idf.py menuconfig

• in menuconfig go to "Example Connection Configuration"
• make sure "connect using WiFi interface" is selected
• fill in your WiFi SSID and Password
• make sure that "connect using Ethernet interface" and "Obtain IPv6 address" are NOT enabled
• return into main menu and go to "Cryptoticker configuration" - you can set display brightness here (more options maybe in the future)
• return into main menu and go to "Component config" -> "ESP-TLS"
• select "Allow potentially insecure options" and "Skip server certificate verification by default" - this ovecome the need to have valid (updated) bitfinex api certificate in the code
• save the configuration and quit menuconfig
• connect ESP32-C3 to the computer if not connected yet
• buid and flash using following command (replace /dev/ttyUSB0 with your serial port)

idf.py -p /dev/ttyUSB0 build flash monitor

• wait until build and flash is finished, serial monitor will be started when flashing is finished and your new ticker will boot up (press CTRL + ] to quit the monitor)
• enjoy your new bitcoin ticker :D