Product Description

SPECIFICATION:

• Electrical parameters:  JSN-SR04T
• Operating voltage:  DC 3 ~5.5V
• Quiescent current:  < 8mA
• Acoustic emission frequency:  40khz
• Farthest range: 600cm
• Recent range: 20cm
• Distance measurement accuracy: ± 1cm
• Resolution: 1mm
• Measuring angle: 75 degrees
• Input trigger signal: TTL pulse above 10uS
• Serial send command: 0X55
• Output echo signal: Output pulse width level signal, or TTL
• 3-5.5V (power positive)
• Trig (RX) RX
• Echo (output) TX
• GND (power supply negative
• Product Size: L42 * W29 * H12 mm
• Working temperature: -20 ℃ – +70 ℃
• Product color: PCB board is blue

Product Features

• 1.Small size, easy to use
• 2. low power consumption
• 3. High accuracy
• 4, detection of blind spots, farther away
• 5, the output method of diversification, pulse width output, serial output

Note: 

• This module should not be charged connection, to live connection, then let the module first GND connected, otherwise it will affect the normal work of the module.
• Ranging, the measured object area of not less than 0.5 square meters and the plane as required to smooth, otherwise affect the measurement results.

The default working mode is Mode 1:

• Mode 1: R27 = open that is not welding. The pattern is described below
• Basic working principle:
• Using IO port TRIG trigger range, to a minimum of 10us high letter.
• Module automatically send 8 40khz square wave, automatically detect whether the signal back;
• There is a signal to return, through the IO port ECHO output a high level, the high level of continuous time is the ultrasound
• From the time of launch to return. Test distance = (high time * sound velocity (340M / s)) / 2;
• When the module is triggered, if no echo is received (the reason is more than the measured range or the probe is not positive On the measured object),
• ECHO port will automatically become low after 60MS, marking the end of the measurement, regardless Power or not.
• LED indicator, LED non-power indicator, it will receive the trigger signal after the module, this When the module is in working condition.
• Only need to provide a pulse above 10uS trigger signal, the module will be issued within 8 40kHz cycle levels and detect echo. The echo signal is output once an echo signal is detected. Reverberations
• The pulse width of the pulse is proportional to the measured distance. Thereby by transmitting a signal to the received echo signal time interval
• Can calculate the distance. Formula: uS / 58 = cm or uS / 148 = inches; or: distance = high time *Sound speed (340M / S) / 2;
• The recommended measurement period is 60ms or more to prevent the impact of the transmitted signal on the echo signal.

Mode 2: R27 = 47K is the welding 47K resistance. The pattern is described below:

• Serial output format for the TTL level, that: 100MS module for the cycle of automatic transmission
• The value of the distance, in mm. Serial baud rate: 9600, n, 8,1.
• Module power recognition, directly into the work mode, the module to conduct a distance every 100ms range,
• And outputs one frame from the pin TX with four 8-bit data. The frame format is: 0XFF + H_DATA + L_DATA + SUM
• 1.0XFF: for a frame to start the data, used to judge;
• 2.H_DATA: the upper 8 bits of the distance data;
• 3.L_DATA: the lower 8 bits of the distance data;
• 4.SUM: data and, for the effect of its 0XFF + H_DATA + L_DATA = SUM (only low 8)
• Note: H_DATA and L_DATA synthesize 16-bit data, that is, the distance in millimeters.
• Description: The module outputs the nearest distance value in the dead zone. If the module does not measure data or is out of range Measured output 0.
• LED indicator, LED non-power indicator, the module connected to work after the light, then the module is in Working state.

Mode 3: R27 = 120K is the welding 120K resistance. In the serial port mode :

• Module power recognition, the module into the standby state, the serial output format for the TTL level, the serial port baud rate:
• 9600, n, 8, 1. When the RX port receives the 0X55 instruction, the module starts a ranging and outputs from the pin TXOut of a frame with 4 8-bit data.
• The frame format is: 0XFF + H_DATA + L_DATA + SUM
• 1.0XFF: for a frame to start the data, used to judge;
• 2.H_DATA: the upper 8 bits of the distance data;
• 3.L_DATA: the lower 8 bits of the distance data;
• 4.SUM: data and, for the effect of its 0XFF + H_DATA + L_DATA = SUM (only low 8)
• Note: H_DATA and L_DATA synthesize 16-bit data, that is, the distance in millimeters
• Description: The module outputs the nearest distance value in the dead zone. If the module does not measure data or is out of range Measured output 0.
• LED indicator, LED non-power indicator, it will receive the 0X55 trigger signal in the module, this When the module is in working condition.