B4XGoods-B4X好物整理，每周六更新

This is a wrapper for Adafruit-GFX library: https://github.com/adafruit/Adafruit-GFX-Library This is a graphics library. It is used by other lower level libraries.

@Erel · 2017-01-16

B4RLibraryB4R LED

TM1637 - 4 digits display

Arduino library for TM1637 (LED Driver)

@Erel · 2017-01-15

B4RSnippetB4R motor

driving xy stepmotors by single byte

driving two motors (x,y) with 16 steps can be realized by one byte orders (16 stepmodes in upper 4 bit, 16 in lower 4 bit)

@Hans- Joachim Krahe · 2017-01-08

B4RTutorialTimer

Timers, Loopers and CallSubPlus

Timers, Loopers and CallSubPlus

@Erel · 2017-01-08

B4RSnippetB4R motor

driving xy stepmotors by single byte within redundance

driving xy stepmotors by single byte within redundance

@Hans- Joachim Krahe · 2017-01-05

B4RSnippetMaths

hex to int

hex to int

@Hans- Joachim Krahe · 2017-01-03

B4RLibraryComms & Network

ESP8266 Ping

Implements a ping feature which can be useful to test whether a remote server is reachable.

@Erel · 2017-01-01

B4RSnippetB4R sensor

HB100 RF sensor

This is a Doppler RF transmitter and receiver which can be used as a movement alert.

@derez · 2016-12-05

B4RLibraryB4R other hardware

rMCP2515

This is a wrapper for MCP2515 library

@Erel · 2016-11-22

B4RSnippetButton

SN74HC165 Shift Register for multi input

The SN74HC165 Shift Register enables connecting many buttons to the Arduino/ESP8266 using only 4 pins.

@derez · 2016-11-20

B4RLibraryB4R LED

rLedControl

This is an Arduino library to control MAX7219 and MAX7221 Led display drivers.

@Erel · 2016-11-17

B4RLibraryB4R LED

rMAX7219LedMatrix

Wrapper for: https://github.com/squix78/MAX7219LedMatrix This is an ESP8266 library.

@Erel · 2016-11-17

B4RTutorialB4R other hardware

Reed Switch Monitor Example

B4R & B4J experiment to monitor the state of a Reed switch connected to an ESP8266 - a NodeMCU is used.

@rwblinn · 2016-11-02

B4RLibraryB4R keypad

Keypad

Simple library that monitors keypad key presses.

@Erel · 2016-10-30

B4RLibraryDatabase

RDC based on MQTT

This is an extension to jRDC2. It adds support for MQTT and allows accessing the remote database with an Arduino or ESP8266 board.

@Erel · 2016-10-27

B4RTutorialB4R relay

ESP8266 + Relay = Let there be light

Relays are electronic switches that allow low power (voltage) devices to control high power circuits. In this example the ESP8266 board controls a regular 220v light bulb.

@Erel · 2016-10-09

B4RSnippetDate/time

DATE to Uint - Unit to Date Converter

I using this code, Because Board has a problem for records size capacity of epprom.

@Tayfur · 2016-10-08

B4RSnippetDate/time

TIME to Uint - Unit to TIME Converter

I using this code, Because Board has a problem for records size capacity of epprom.

@Tayfur · 2016-10-07

B4RSnippetB4R other hardware

74HC595 Shift Register for multiple output

The attached implements a code module for use of a shift register for getting multiple outputs while using only 3 pins of the arduino/esp.

@derez · 2016-09-30

B4RTutorialFirebase

Using Firebase to send notifications to iOS and Android devices

When the button is clicked, two http requests are sent to Firebase REST api. Any subscribed Android or iOS device will receive the push message. It is a very simple and powerful solution It is simple as you don''t need a server and it is powerful as the messages will arrive even when the apps are not running. The solution works over the internet, it is not limited to the local network.

@Erel · 2016-09-29

B4RTutorialB4R

Using PROGMEM to save memory

The smaller Arduinos like the Arduino Uno have 2k of RAM. The subs stack and the global variables use this memory. If your program includes constant data then you can use PROGMEM to store the data in the program code and access it without loading the whole data into the the limited RAM.

@Erel · 2016-09-19

B4RLibraryB4R sensor

rAPDS9960 - Gesture Sensor

APDS 9960 gesture and RGB sensor: https://www.sparkfun.com/products/12787

@Erel · 2016-09-07