B4XGoods-B4X好物整理，每周六更新

B4RSnippetB4R other hardware

Mini Battery Display - Inline C

Here is a quick example of inline C being used to power a mini battery display. As there''s no library for this display on the forum, I used inline C with the original Arduino IDE source code. I''ve slimmed down the inline C code to make it easier to read. You can find the original library and source code on Github, just copy the 2 library files into your Arduino IDE library folder.

@Peter Simpson · 2017-05-11

B4RSnippetB4R motor

Set servo angle via potentiometer and show on display

SubName: Set a servo angle and show the angle reading on a OLED display Description: Their are already a few servo examples on this forum, but here is my take on it. I''m using a quality TURNIGY servo and a standard cheap 10kÎ© potentiometer. As you turn the potentiometer the display changes to shows you the angle that the servo is set to, reading ranges from 0Â° to 179Â°.

@Peter Simpson · 2017-04-19

B4RSnippetB4R sensor

Reading and display voltage and current made easy

SubName: Reading voltage and current and display the results onto an OLED display. Description: Use the code below to display the voltage and current from load connected to a MAX471 module. The Max471 is a low cost precision high side current sense amplifiers with a maximum supply voltage of 36V. I personally would not push it that high, but putting 25V through it for a 5V Arduino or compatible device is more than adequate.

@Peter Simpson · 2017-04-16

B4RSnippetB4R sensor

Reading temperature sensor DS18B20 via inline C/C++, again

You can use this basic code to read the temperature readings from a DS18B20 temperature module, this can easily be done using inline C/C++. I''m reading Â°C but you can easily change it to Â°C by replacing ''sensors.getTempCByIndex(0)'' with ''sensors.getTempFByIndex(0)''.

@Peter Simpson · 2017-04-01

B4RSnippetB4R sensor

Temperature sensors comparison - DS18B20 vs DHT11

Comparing the DS18B20 and the DHT11 temperature sensors at the exact same time This is just a quick comparison between the two above named temperature sensors, nothing special really. I was looking through my Arduino parts toolbox when I suddenly realised that I had two types of temperature sensors, I had not even opened the anti-static bag with the DHT11 inside it, so I decided to place them both on a mini breadboard with a 4 pin OLED display to compare and display their temperature readings.

@Peter Simpson · 2017-04-01

B4RSnippetButton

Long press short press one button

This is just one solution on how to tell if a button is being long pressed or short pressed. There are plenty of other solution to do this, this is my take on it, it''s simple but effective.

@Peter Simpson · 2017-03-30

B4RSnippetDrawing

Example of GFX.drawLine (Adafruit GFX library)

Use this code to draw and rotate lines onto an OLED display. You will need the rAdafruitSSD1306 and rAdafruitGFX libraries loaded into your libraries tab. The code is simple enough to follow once you get your head around it, this is good for learning GFX.drawLine.

@Peter Simpson · 2017-03-10

B4RSnippetB4R WeMos

HMC5883L interfacing with Wemos...

Interface HMC5883L (Triple-axis Magnetometer (Compass)) with Wemos (ESP8266) with inline C

@rbghongade · 2017-03-07

B4RSnippetMaths

Modulo Operator (Inline C)

Modulo Operator (Inline C)

@inakigarm · 2017-03-06

B4RSnippetComms & Network

Set IP address static/fixed for ESP8266

Set IP address static/fixed for ESP8266

@ilpesce · 2017-03-06

B4RSnippetB4R sensor

measuring low frequenzy with ADXL335

measuring low frequenzy with ADXL335

@Hans- Joachim Krahe · 2017-03-04

B4RSnippetB4R clock

Display the current time via DS1302 RTC

Displaying the current time on a 4 Bit 7 segment display from a battery backed up DS1302 RTC (Real Time Clock).

@Peter Simpson · 2017-03-03

B4RSnippetB4R EEPROM

EEPROM Clear

This example illustrates how to set of all of the bytes to zero (0), initialising them to hold new information, using the EEPROM.WriteBytes function.

@Peter Simpson · 2017-03-01

B4RSnippetSerial comm/USB

Arduino Serial Command Framework

This framework simplifies serial interfacing via a command / response infrastructure. My Arduino projects are usually purely gadget interfaces linked to a higher functioning PC/ORDROID/Android device to actually do the orchestration. There is a built in method to identify the board via an ID and physically by blinking an on board led (pin 13).

@mrred128 · 2017-02-25

B4RSnippetB4R sensor

Switch a relay (to On) when it gets dark via an LDR and PIR

Switch a relay (to On) when it gets dark via an LDR and PIR

@Peter Simpson · 2017-02-23

B4RSnippetB4R sensor

Reading two sensors by A0 pin

Reading two sensors by A0 pin

@derez · 2017-02-20

B4RSnippetB4R LED

Control LED brightness via 1838 IR receiver

You can use this basic code to control an LED (or anything else for that matter) that you want with a standard IR receiver. I was using a single off board VS1838B/TL1838 38KHz IR receiver with a Samsung TV remote control. Using the PWM (Pulse Width Modulation) pins is essential for controlling the brightness.

@Peter Simpson · 2017-02-18

B4RSnippetJSON

Data JSON Format to Node-RED

For sending data from Arduino/ESP to Node-RED (running on a Raspberry Pi), JSON format is an option as Node-RED provides simple methods for parsing JSON. The example sub writes via asyncstream a Key:Value Pair Array as a JSON string.

@rwblinn · 2017-02-14

B4RSnippetB4R WeMos