MB7052 & MB7092 Pin Out

GND

Return for the DC power supply. GND (& V+) must be ripple and

noise free for best operation.

operation is 2.1mA (50mA peak) and 5V operation is 3.4mA (100mA

peak) respectively. Peak current is used during sonar pulse transmit.

asynchronous serial with an RS232 format, except voltages are 0-Vcc.

The output is an ASCII capital “R”, followed by three ASCII character

digits representing the range in centimeters up to a maximum of 765,

followed by a carriage return (ASCII 13). The baud rate is 9600, 8 bits,

no parity, with one stop bit. Although the voltages of 0V to Vcc are

outside the RS232 standard, most RS232 devices have sufficient margin

to read the 0V to Vcc serial data. If standard voltage level RS232 is

desired, invert, and connect an RS232 converter such as a MAX232.

When Pin 1 is held low, the Pin 5 output sends a single pulse, suitable for

low noise chaining (no serial data).

unconnected or held high, the sensor will continually measure the range.

If Pin-4 is held low the sensor will stop ranging. Bring high 20uS or

more to command a range reading.

(Vcc/1024) per cm. A supply of 5V yields ~4.9mV/cm., and 3.3V yields

~3.2mV/cm. Hardware limits the maximum reported range on this output

to ~700 cm at 5V and ~600 cm at 3.3V. The output is buffered and

corresponds to the most recent range data.

To calculate the distance, us a scale factor of 58uS per cm.

MB7092 This pin outputs the analog voltage envelope of the acoustic

waveform. For the MB7092, this is a real-time always-active output.

Pin 1 is held low the Pin 5 output sends a pulse (instead of serial data),

suitable for low noise chaining.

MB7052 & MB7092 Circuit

MB7052 & MB7092 Real-time Operation & Timing

MaxBotix, MaxSonar, & WRMA1 are trademarks of MaxBotix Inc.

XL-WR1™ XL-WRMA1™ • v1.9b • Patent 7,679,996 • Copyright 2005 - 2011

MB7052

MB7092

175mS after power-up, the ML-MaxSonar

require at least three range cycles in a row for the first *valid range output. If Pin-4 is left open (i.e. unconnected) or held

high (20uS or greater), the sensor will take a range reading. Each range cycle starts by Pin-4 being high or open, after which

the sensor calibrates for 20.5mS, and after which, thirteen 42KHz waves are sent. The sensor then determines the range to the

target. Next the analog range voltage is set. At 94.3mS, for the next 4.7mS the serial data is sent.

cycle of 99.5mS.

per cm, and the range cycle completes at 149mS.

*MB7052 & MB7092 Fail Safe

The ML sensors will report the latest valid range reading. Valid range readings are range readings that are correlated and

sufficiently noise free. Valid range readings, once obtained, are held (and resent) a new valid reading set is obtained or until

Fail Safe times out. After one hour (1.5 hour for the MB7052) of continuous ranging with no targets detected as valid, the

sensor will report “R000” as the serial range output, set the analog-voltage range output to zero volts, (and stop sending the

pulse-width output for the MB7052). The zero value is the output for a fail-safe value.

MB7052 & MB7092 Real-time Auto Calibration

Each time before the ML-MaxSonar

If the temperature, humidity, or applied voltage changes during sensor operation, the sensor will continue to function

normally. (The sensor does not apply compensation for the speed of sound change verses temperature to any range readings.)

The sensor functions using active components

consisting of an LM324 and PIC16F690, together

with a variety of other components. The schematic

is shown to provide the user with detailed

connection information.

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