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CJMCU7620 Arduino-Compatible Gesture Recognition Sensor

This PAJ7620-based sensor offers a built-in proximity sensor and is capable of detecting 9 various hand gestures (up, down, left, right, forward, backward, clockwise, counterclockwise and waving). The I2C bus makes it easy to interface with a large variety of microcontrollers. 

Voltage: 3.3VDC 

Size: 21x15mm
 

What is the CJUMCU-811 Module?

CO2 and VOC indoor air quality sensor module for Arduino and other microcontroller projects

This module has a CCS811 module that is an ultra low powered digital gas sensor using a metal oxide multi compound sensor. The module uses the onboard MCU to manage the sensor and provide the needed Analogue to Digital conversion and I2C interface making it simple to add to your project. It will detect a wide range of VOCs including Carbon Monoxide and can convert this to an eCO2 (equivalent CO2) value.
 

Voltage: 3.3VDC 

Size: 21x15mm
 

How Can I use the CJUMCU-811 to test air quality and CO₂ levels?

Here is an example project for an air quality meter using the CJUMCU-811, an Arduino Uno and a 1602 LCD screen with a KY1602 to display CO2 levels and air quality:

Air Quality Sensor with LCD

In this project, we will be building an air quality station that can measure eCO₂ (estimated carbon dioxide) levels and a wide range of VOCs (Volatile Organic Compounds). High VOC levels can contribute to a wide range of health complications and high CO₂ levels (>1000ppm) can impair normal cognitive function, so it is useful to be able to monitor them.

Here’s what you will need:
 

Tools
Soldering Iron
Solder
Jumper Leads (male to female)

Components
CJMCU811 x 1
LCD1602B LCD screen x1
Arduino Uno x 1 or Arduino Nano x 1
KY1602 Parallel to Serial converter
 

Libraries

CCS811 Arduino Library

PCF8574 Arduino Library

Step 1
First you will need to assemble the project. The CJMCU should come with a set of pin headers that need to be soldered directly on it and the KY1602 should be soldered directly to the back of the LCD screen. Now, connect everything together using the wiring diagram below for reference.

Connecting the CJMCU811 to an Arduino       Connecting the KY1602 to an Arduino and a 1602 LCD 
CJMCU                           Arduino                     KY1602                          Arduino            LCD
VCC----------------------------3.3V                       VCC-----------------------------5V
GND----------------------------GND                      GND----------------------------GND
SCL------------------------------A5                        SCL-----------------------------A5
SDA-----------------------------A4                         SDA-----------------------------A4
                                                                        Pins 1-16---------------------------------------Pins 1-16*

 *pin 1 on the KY1602 is the one nearest to the 4 data and power pins

Step 2
Connect your Arduino to the PC and install the above Libraries. If you don’t know how to do this, CLICK HERE and follow the “Installing Arduino Libraries” section.

Step 3
We can now create the code to get this all working:

First, delete the code in the IDE window, then include the aforementioned libraries:  

 
    
#include <LCD_I2C.h> 
#include <Wire.h> 
#include "SparkFunCCS811.h" 
    

Now, We need to declare the I2C devices and their addresses:  

 
    
#define CCS811_ADDR 0x5B 
LCD_I2C lcd(0x27, 16, 2); 
CCS811 sensor(CCS811_ADDR); 
    

Initialize the I2C devices and turn on lCD backlight in the setup function:

 
    
void setup() 
{ 
  Wire.begin(); 
  lcd.begin(); 
  lcd.backlight(); 
 
    

Start serial communication  

 
Serial.begin(115200); 
delay(1000);

Check to see if the CJMCU is configured correctly, otherwise display error message:

 
    
if (sensor.begin() == false) 
  { 
  Serial.print("Sensor error. Check connection"); 
  while (1); 
  } 
    

Starting the void loop function. Check to see if the data from the sensor is available, and if so, read and calculate the results:

 
    
if (sensor.dataAvailable()) 
  { 
  sensor.readAlgorithmResults(); 
    

Send the data via serial port:

 
    
Serial.print("CO2["); 
  Serial.print(sensor.getCO2()); 
  Serial.print("] tVOC["); 
  Serial.print(sensor.getTVOC()); 
    

Display the same data on the LCD display:

 
    
lcd.setCursor(0,0); 
lcd.print("Est. CO2 - "); 
  lcd.print(sensor.getCO2()); 
  lcd.setCursot(0,1); 
lcd.print("Tot. VOC - "); 
  lcd.print(sensor.getTVOC()); 
  } 
    

Add 10ms delay to prevent overloading the I2C bus:

 
    
delay(10); 
    

The completed code should look like this:

 
    
/*  
Connecting the CJMCU811 to an Arduino Uno or an Arduino Nano:  
 
CJMCU811       Arduino 
VCC-------------->3V3 
GND-------------->GND 
SCL-------------->A5 
SDA-------------->A4 
*/ 
  
#include <lcd_i2c.h> 
#include <wire.h> 
#include "SparkFunCCS811.h" 
LCD_I2C lcd(0x27, 16, 2); //Address of the KY1602 module 
#define CCS811_ADDR 0x5A //if it doesn't work, change to 0x5B 
 
CCS811 sensor(CCS811_ADDR); 
 
void setup() 
{ 
  Wire.begin(); //Initialize I2C Hardware 
 
  lcd.begin(); // If you are using more I2C devices using the Wire.h library, use lcd.begin(false) 
 
  lcd.backlight(); 
 
  Serial.begin(115200);  //Starting serial communication 
  delay(1000); 
 
   
  if (sensor.begin() == false) 
  { 
  Serial.print("Sensor error. Check connection"); 
  while (1); 
  } 
} 
 
void loop() 
{ 
  if (sensor.dataAvailable())//Check to see if data is ready with .dataAvailable(). if statement checking to see  
  { 
  //If so, have the sensor read and calculate the results. 
  sensor.readAlgorithmResults(); 
   
  Serial.print("CO2["); //Returns estimated CO2 reading 
  Serial.print(sensor.getCO2()); 
  Serial.print("] tVOC[");//Returns calculated total VOC reading 
  Serial.print(sensor.getTVOC()); 
 
  lcd.setCursor(0,0); 
  lcd.print("Est. CO2 - "); 
  lcd.print(sensor.getCO2()); 
  lcd.setCursor(0,1); 
  lcd.print("Tot. VOC - "); 
  lcd.print(sensor.getTVOC()); 
  } 
  delay(10); //Prevents overloading of the I2C bus 
} 
    

Step 4 Press the “Upload” button at the top (button with tick, located below “File”). The IDE will now compile the code and upload it to your Arduino (this may take a few moments).

Step 5 To check if everything is working, open the serial monitor from the Arduino IDE (magnifying glass button in the top right corner) and see if you can get a reading. The CJMCU has to be left on for 24 hours before it will give a correct reading. If everything is connected correctly, the LCD should also show readings from the sensor.

Step 6 That’s it! You should now have a fully working air quality sensor. Now all you need to decide is what sort of enclosure you want to put it in. You can look at our high quality boxes HERE for ideas.

XR2206 Signal Generator Kit 1Hz 100MHz Frequency Range with Adjustable Frequency

XR2206 High precision signal generator


Circuit characteristics:

• Can produce sine wave, triangular wave, square wave

• Frequency can be from 1HZ-1MHZ

• Frequency, amplitude adjustable;

• five-bit precision resolution;

• Frequency adjustment has coarse adjustment and fine adjustment;

• Wide range of power supply, can use external power 9-12V or 9V battery;

• All in-line components, small number of components, simple installation and debugging.
Parameters: Technical specifications:

Power supply voltage: 9-12V DC input
Waveform: square, sine and triangle
Impedance: 600 ohms + 10%
Frequency: 1hz-1mhz
Sinusoidal wave
Amplitude: 0-3V at 9V DC input
Distortion: less than 1% (1kHz)
Flatness: + 0.05db 1hz expansion
Square wave
Amplitude: 8v (no load) at 9V DC input
Rise time: less than 50ns (1kHz)
Drop time: less than 30ns (1kHz)
Symmetry: less than 5% (1kHz)
Triangular wave
Amplitude: 0-3V at 9V DC input
Linearity: less than 1% (up to 100kHz) 10ma

Active sound-reinforcement speakers with polypropylene enclosures and built-in class-D amplifier modules. Each cabinet is equipped with an extended frequency main driver and a titanium compression driver for optimum clarity. Power from the internal bi-amplifier is controlled from an internal DSP section, offering pre-set profiles with crossover, EQ and dynamics processing to suit the program material. Custom settings can be created via the onboard rotary encoder and backlit display or by connecting the CLARA unit to a PC or laptop via USB and editing using the free-to-download ADU software application. 2 combo inputs on the rear panel can accept balanced or unbalanced line level audio with 6.3mm jack or XLR connection. An integral Bluetooth® receiver can be paired to a smart phone and audio can be streamed wirelessly through input A. In addition to a line level input for input B, there is a mic/line level switch to enable direct connection of a microphone. Maximum sound impact from a lightweight and easy to manage cabinet.

• DSP speaker management with editing software
• Bluetooth connectivity
• High power class-D bi-amplifier
• High impact PP cabinet with side & top handles
• 35mm pole mount socket

Red 5mm Water Clear Seriously Bright LED 20,000mcd.625nm

Max Voltage 2.5V

Max Current 50mA

Angle 15deg

Opto Coupler. Diode 5V 60mA max. Detector 18V 100mA max. 7KV isolation

Opto Coupler. Emitter 5V 100mA max, Detector 80V 100mA max. 6DIL

Opto Coupler. In: 6V 60mA, Out: 50V 40mA. CTR: 40% min. No Base 6DIL

OPTOISOLATOR No base. In: 5V 100mA max. Out: 50V 100mA max 40% min. 6DIL

OPTOISOLATOR In: 5V 100mA max. Out: 50V 100mA max. 40% min. 6DIL

OPTOISOLATOR In: 5V 60mA. Out 32V 50mA. 100% min. Isolation Voltage: 3.75KVAC 6DIL

OPTOISOLATOR 63% min No base 6DIL

OPTOISOLATOR 100% No base 6DIL

OPTOISOLATOR 5PIN

OPTOISOLATOR 6DIL

OPTOISOLATOR High Insulation 3mm thick. 1000Vrms. 32V 50% min. 5uS 4PIN THICKPACK

Opto Sensor Reflective 32V 1.5% 4pin

4 Opto Isolators in16DIL package

OPTOISOLATOR 160% min 6DIL

Adaptor: Coax (TV aerial) socket (female) to F (Satellite or Cable TV) socket. All metal. Joins a Coax Plug to and F Plug.

Adaptor: Coax (TV aerial) socket (female) to F plug (male). Fully Screened.Nickel Plating

Digital stereo PA amplifier with integral media player in a compact housing

This compact class-D amplifier can deliver up to 2 x 55W output, ideal for background music in a shop or restaurant. There is a microphone input that can be used for announcements.

The media player section can select between USB / microSD mp3 player, FM tuner, Bluetooth receiver, 2 stereo line inputs (rear panel RCA) and another line input on the front panel (3.5mm). Playback can be controlled from the front panel or by the supplied I.R. remote control.

Mounting brackets are provided which enable the A22 to be fitted under a counter top or against a wall for discreet installation. Two A22 units may be mounted side-by-side into a 1U rack space, which can serve smaller peripheral zones in a larger PA installation.

Combine with 2 or 4 speaker units for a truly space-saving sound system with comprehensive and easy-to-use functions.

• Compact and easy-to-use control panel
• Bluetooth receiver
• FM tuner
• USB / microSD mp3 player
• Supplied with I.R. remote control
• Supplied with 4 rotatable mounting brackets
• Microphone input with separate volume control

Power supply :230Vac, 50Hz (IEC)

Speaker :      impedance 4 - 8 Ohms (each channel)

Output power : 8 Ohms 2 x 25W rms / 2 x 40W max. (@ 1kHz 10% THD)

Output power : 4 Ohms 2 x 35W rms / 2 x 55W max. (@ 1kHz 10% THD)

Inputs : Line Aux 1 (3.5mm), Aux 2 (L+R RCA), Aux 3 (L+R RCA)

Input : mic 6.3mm jack

Controls Mic Volume, Treble, Bass, Music Volume

Audio source USB/microSD player, FM tuner, Bluetooth

Antenna connection F-type (FM tuner)

Dimensions 215 x 180 x 43mm

Weight 820g

Compact Dual UHF Microphone Set 864.8+863.1MHz

Compact Dual UHF Microphone With Adjustable Carrier Frequency

XU series wireless microphone systems offer pro-level features in a compact receiver with premium microphone transmitters. Supplied as a half-width 1U rack receiver with 1, 2 or 4 channels of either handheld microphones or bodypack transmitters with a neckband and lavalier mic option. The receiver is a true diversity type with dual antennas and internal distribution for minimizing dropouts. The front panel has a volume control and indicator LEDs per channel alongside a colour TFT display with level indications for each channel and settings for channel frequencies and colours. Each transmitter also has its own LCD display for frequency and battery status, with a backlight that can be set to one of 6 colours for identification. Carrier frequencies are arranged in 10 groups with carriers in both the UK/EU license-free UHF and PMSE licensed duplex gap UHF bands. Each set is supplied with hardware for mounting into a 1U rack space with extension cables to enable front mounting of the antennas. For a wireless microphone system with straightforward operation and intuitive features, the XU series delivers freedom and reliable operation to vocalists, presenters and instructors
in a compact and convenient package.

AV to HDMI converter

Upscales standard Definition video & audio to HD (HDMI) to 720P or 1080P (Switchable).

Connects older equipment without a HD output to a modern HD TV.

USB powered. 

Supported Inputs: NTSC 480i or PAL 576i

Selectable Outputs: 720P or 1080P

Package Contents
HDMI converter
USB cable

Composite Video to VGA Converter
Converts a Composite (TV) signal to VGA signal with phono (RCA) outputs (BNC adaptor available see BPP). VGA output resolutions up to 1920x1080. Small size, powered from a USB socket it can connect to HD CCTV,  PCs, etc. 

*  Pure hardware design,  just Plug & Play
*  No software driver requirement.
*  Supports VGA resolutions 640x480 at 60 fps; 800x600 60 fps, 75 fps; 1024x768 60 fps, 75 fps; 1280x720 at 60 fps; 1280x768 60 fps, 75 fps; 1280x1024 60 fps, 75 fps; 1360x768 at 60 fps; 1400x1050 60 fps; 1440x900 60 fps; 1680x1050 at 60 fps; 1600x1200 60 fps; 1920x1080 60 fps resolutions.
*  Inputs: Composite Video and Stereo Audio (RCA), and USB (power)
*  Outputs: VGA, 3.5mm line out
*  Powered from USB port
*  PAL or NTSC system

Package contents:
Composite to VGA converter
Manual
USB Power cable

100 Watt Comprossion Horn Driver - 200W max 100W rms

Reflector horn with 1inch throat, and1¾ inch thread.

Should be connected through a cross-over or capacitor approx 3.3uF bipolar

*  Titanium diaphragm
*  Kapton bobbin
*  Copper clad aluminium voice coil
*  Gold plated spring terminals

Impedance: 8 ohms
Frequency Response: 1500Hz-20000Hz
Diameter: 90mm
Length: 63mm

15 oz Magnet
Power: 100 WattsRMS, 200W Max
SPL @ 1W/1m : 95dB