Proximity 3 click
PID: MIKROE-2801
Weight: 22 g
Proximity and light sensing
Proximity 3 click is an intelligent proximity and light sensing device, which features
the VCNL4200 sensor from Vishay - high sensitivity long distance proximity sensor (PS),
ambient light sensor (ALS) and 940 nm IRED, all in one small package.
With its smart sensing and light conditioning properties, the Proximity 3 click can be used in a
wide range of applications: adjusting the brightness of the TFT screen depending on ambient
light, turning off the TFT background light if it is covered, very accurate lux meters, reliable
security sensors and so on.
How the Proximity 3 click works
Proximity 3 click uses the VCNL4200 sensor, which combines matched 940 nm IR emitter and a
photodiode for proximity measurement and ambient light sensing. VCNL4200 offers
programmable measurement by utilizing the advanced signal processing techniques, allowing the
sensor to operate in various conditions. Communication with the microcontroller is done via the
I2C interface so that the host controller can set the measurement parameters and request results
back from the sensor.
Both low and high threshold values for the measured property can also be set via the I2C so that
the interrupts can be generated every time the threshold value is exceeded. This allows for the
reduced need of the sensor polling, which can result in better power management. With
MikroElektronika library functions, setting up the registers is really easy and the tedious task of
initializing the sensor is taken care of with a few simple function calls. More information about
the sensor's registers and addresses can be found in the VCNL4200 datasheet.
The Filtron™ technology used in the ALS, allows the sensor to match the ambient light spectral
sensitivity to human eye response and it's immune to fluorescent light flicker. This ensures the
accuracy of the measurements. The maximum detection range is selectable (197 / 393 / 786 /
1573 lux) with highest sensitivity 0.003 lux / step.
The proximity sensor uses advanced ambient and background light cancellation schemes, so it is
fairly immune to interferences that might occur in this case. This allows for a quite precise
proximity detection. The sensor can work either in 12-bit or 16-bit mode, selectable by I2C
command. The click's range is up to 1.5m.
VCNL4200 input voltage is 3V3, while the separate 5V supply rail is used to supply power for
the IR emitter pulses, generated by the small external P-channel MOSFET (Q1). This way, the
power dissipation of the IRED drive is displaced from the chip, and the high-current IRED drive
pulses are isolated from the sensitive integrated circuit sections, connected to the 3V3 rail.
Specifications
Type
Proximity
Applications
Adjusting the brightness of the TFT screen depending on ambient light, turning off the
TFT background light if it is covered, very accurate lux meters, reliable security sensors,
etc.
On‐board
modules
VCNL4200 sensor ‐ high sensitivity long distance proximity sensor (PS), ambient light
sensor (ALS) and 940 nm IRED, intelligent background light cancellation
Proximity distance up to 1.5 m, immunity to the red glow (940 nm IRED) and fluorescent
Key Features light flickering, selectable maximum detection range (197 / 393 / 786 / 1573) lux with
highest sensitivity 0.003 lux/step
Interface
I2C
Input Voltage 3.3V,5V
Click board
size
S (28.6 x 25.4 mm)
Pinout diagram
This table shows how the pinout on Proximity 3 click corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes
Pin
Pin
Notes
NC
1
AN
PWM
16
NC
NC
2
RST
INT
15
INT
NC
3
CS
TX
14
NC
NC
4
SCK
RX
13
NC
NC
5
MISO
SCL
12
SCL
I2C clock
NC
6
MOSI
SDA
11
SDA
I2C data
Interrupt output
Power supply +3.3V 7
Ground
GND
8
3.3V
5V
10
+5V
Power supply
GND
GND
9
GND
Ground
Proximity 3 click maximum ratings
Description
Min
Typ
Max
Unit
Supply voltage
2.5
3.3
3.6
V
Supply voltage for IRED
3.8
5.0
5.5
V
Operation temperature range
‐40
+85
°C
Supply current
350
µA
IRED driving current
800
Full ALS counts
mA
65535
steps
4095/65535
steps
Full PS counts
I2C clock (std mode / fast mode) 10/10
100/400 kHz
Measurement distance
1.5
m
Onboard settings and indicators
Label
Name
Default
Description
‐
Power LED indicates that the click is powered on
PWR Power LED
Software Support
We provide a demo application for the Proximity 3 click on our LibStock page, developed using
MikroElektronika compilers. The demo can run on all the main MikroElektronika development
boards with minimal change to the code depending on the microcontroller used.
Library Description
This library contains a set of functions, necessary to work with the Proximity 3 click.
Key functions
uint16_t prox3_readALS() - Reads value from ALS register
uint16_t prox3_readPS() - Reads value from PS register
uint16_t prox3_getDistance() - Calculating distance
uint16_t prox3_getIlluminance() - Calculating illuminance
Examples Description
This is a simple demonstration of sensor functionality, where the user can read the distance and
illuminance data from Proximity 3 click. Distance and illuminance values are sent via UART.
The application is composed of three sections:
System Initialization ‐ I2C and UART module initialization
Application Initialization ‐ Sends HAL pointers, and initializes the VCNL4200
Application Task ‐ Sequential reading of the distance, proximity and ambient light data from the
sensor and logging it to UART, every second
void applicationTask()
{
// DISTANCE READ AND CONVERT VALUE TO STRING
resultPS = prox3_getDistance();
IntToStr( resultPS, txt1 );
// WRITES INFORMATION
UART1_Write_Text(
UART1_Write_Text(
UART1_Write_Text(
TO UART
"Proximity: ~ " );
txt1 );
" cmrn" );
// AMBIENT LIGHT READ AND CONVERT VALUE TO STRING
resultALS = prox3_getIlluminance();
IntToStr( resultALS, txt2 );
// WRITES INFORMATION
UART1_Write_Text(
UART1_Write_Text(
UART1_Write_Text(
TO UART
"Ambient Light: " );
txt2 );
" luxrn" );
Delay_ms(1000);
}
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
I2C
UART
Conversions
Additional notes and information
Depending on the development board you are using, you may need USB UART click, USB
UART 2 click or RS232 click to connect to your PC, for development systems with no UART to
USB interface available on the board. The terminal available in all MikroElektronika compilers,
or any other terminal application of your choice, can be used to read the message.
https://www.mikroe.com/proximity‐3‐click 12‐5‐17
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