Parallax Sensors

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PARALLAX

Sensors

These sensors will work with various stamp modules.

DS2760 Thermocouple Kit

Thermocouples provide a low-cost, reliable means of measuring temperature over a wide range. The challenge when using a thermocouple is accurately measuring the very low Seebeck output voltage (fractional to low millivolts) from the element, and providing for cold junction temperature compensation.

The Dallas/Maxim DS2760 High Precision Li+ Battery Monitor is very easily configured into an effective thermocouple interface. The Parallax DS2760 Thermocouple Module capitalizes on this application and provides a complete connection between the BASIC Stamp microcontroller and a standard thermocouple element. The DS2760 Thermocouple has the following features:

• 1-Wire interface allows multiple devices with just one BASIC Stamp I/O pin
• Cold Junction measurement: 0 degrees C to +127 degrees C (0.125 degrees C resolution)
• Low power consumption: Active current = 90 uA max, Sleep current: 2 uA max

In addition to the module (shown above at left), the kit includes 3 Thermocouple elements. They are as follows:

1. K-type (Chromel / Alumel) Range: 32 F to 1873 F (0 to 1023 C)
2. J-type (Iron / Constantan) Range: 32 F to 1873 F (0 to 1023 C)
3. T-type (Copper / Constantan) Range: 32 F to 752 F (0 to 400 C)

This product is ideally suited to work with a BASIC Stamp 2p module (BS2P24, BS2P40, BS2PE). Other BASIC Stamp modules will require a Serial-to-1-Wire protocol converter, as well as code to manage the large tables across program slots thus we recommend the BS2p series.

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Sensirion Temperature/Humidity Sensor

Humidity is notoriously difficult to measure. Some of the scientific and electronic considerations to measuring humidity include: analog to digital interface and external circuitry which might require op-amps or oscillator circuitry; temperature compensation adjustments to calculate dew point; calibration against a known humidity source; mounting, protection and response time in the real-world.

The Sensirion SHT1x addresses many of these issues head on. It is a smart sensor for both humidity and temperature, and it comes from the factory in a tiny package that incorporates the analog to digital interface. All that the BASIC Stamp has to do is read out the humidity and temperature values through the two-wire digital serial interface. The only math required is a simple scale and offset. The SHT1x is factory calibrated so that it returns temperature with a resolution of 0.01 degrees Celsius and relative humidity with a resolution of 0.03 percent. The accuracy is better than most other sensors too. Worst-case temperature accuracy is +/- 2 degrees C - but in the "room temperature" range the accuracy better than +/- 1 degree C. The relative humidity sensor is similarly accurate: +/- 3.5% in the range 20% to 80%. This is quite remarkable for a low-cost sensor. Excellent for commercial or home-based projects that require such readings.

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AD592 Temperature Probe Electronic temperature sensor. Sensor is included in the Applied Sensors parts kit (#28126) RATED: -45 degrees C to +125 degrees C; PERFORMANCE SPECIFIED: -25 degrees C to +105 degrees C.

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Hitachi HM55B Compass Module This Compass Module made exclusively by Parallax is a dual-axis magnetic field sensor built around the Hitachi HM55B IC. Parallax has made this compass IC accessible by providing Hitachi's surface mount sensor chip with a 3 V onboard voltage regulator and resistor protection, all in a 0.3" wide 6-pin DIP module. The Hitachi HM55B Compass Module is compatible with the BASIC Stamp microcontroller's 5 V supply and signal levels. Acquiring measurements from the module is made easy with a synchronous serial interface, and even easier with the BASIC Stamp 2 commands SHIFTIN and SHIFTOUT.

Features: Sensitive to microtesla (µT) variations in magnetic field strength. Simplifies direction by resolving magnetic field measurements into two components axes. 6-bit (64-direction) resolution after calibration. Only 30 to 40 ms between start measurement and data-ready with simple synchronous serial interface. Built-in resistor protection for data pins eliminates bus conflict risks. Compact and breadboard-friendly 0.3 inch, 6-pin DIP package. Compatible with all BASIC Stamp, Javelin Stamp, and SX microcontrollers.

Application Ideas: Mobile and walking robot direction sensor Handheld electronic compass Weathervane indicator for remote weather stations Audible compass for the vision impaired. Automotive electronic compass.

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TSL230 Light to Frequency Converter

The TSL230 programmable light-to-frequency converter combines a configurable silicon photodiode and a current-to-frequency converter on single monolithic CMOS integrated circuits. The output can be either a pulse train or a square wave (50% duty cycle) with frequency directly proportional to light intensity. The sensitivity of the device is selectable and the output frequency can be scaled by one of four preset values. An output enable (OE) is provided that places the output in the high-impedance state for multiple-unit sharing of a microcontroller input line.

Features:

• High-resolution conversion of light intensity to frequency with no external components
• Programmable sensitivity and full-scale output frequency
• Communicates directly to a BASIC Stamp or SX microcontroller
• Absolute output frequency tolerance of +/- 5%
• Nonlinearity error (typically 0.2% at 100kHz)
• Stable over wide variety of temperatures

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Piezo Film Vibra Tab Mass This vibration sensor is model LTD0 manufactured by Measurement Specialties. Whether used as a vibration sensor, a flexible switch, or a frequency response device piezo film is an interesting sensor to interface with BASIC Stamps. Piezo film is used with the COUNT or PULSIN commands on a BASIC Stamp. Note: Output needs to be conditioned before connecting to a BASIC Stamp I/O pin.

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PING))) Ultrasonic Sensor

The PING)))™ sensor measures distance using sonar; an ultrasonic (well above human hearing) pulse is transmitted from the unit and distance-to-target is determined by measuring the time required for the echo return. Output from the PING)))™ sensor is a variable-width pulse that corresponds to the distance to the target.

Interfacing to the BASIC Stamp and Javelin Stamp microcontrollers is a snap: a single (shared) I/O pin is use to trigger the Ping sensor and "listen" for the echo return pulse. And the intelligent trigger hold-off allows the PING)))™ to work with the BS1! An onboard three-pin header allows the PING)))™ to be plugged into a solderless breadboard (on a Boe-Bot, for example), and to be connected to its host through a standard three-pin servo extension cable.

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Part No.       Description                                   Fig.             Price

32PX28022      Thermocouple DS2760 Kit;                        A             $29.50
               0 to 127 degrees C; works  
               well with BS2P stamp modules    

32PX28018      Temperature and humidity sensor;                B              28.95
               2 wire digital serial interface

32PX28130      Temperature probe.                              C              14.50
               -25 degrees C to 105 degrees C. 
               Output is 1mv/K. Ideal for
               submersing in liquids

32PX29123      Compass sensor in a DIP                         D              30.95
               module. Provides an accurate
               128 directions

32PX27924      TSL230 light to frequency converter             E               5.90

32PX605-0004   Piezo Film Tab. used as vibration sensor, a     F               1.95
               flexible switch or a freq. response device.

32PX28015      PING Ultrasonic Sensor provides an easy way     G              29.90
               to measure distance

32PX30056      Force Sensor. 0V is no force, 4.2V is 100lbs    H              24.50
               Ideal output for A/D conversion

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Last Modified February 12, 2007