USB Based 8-Channel Data Acquisition Module Features Applications

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Interfacing with boardPush to On Switch – If you wish to connect a push to on switch to any of the IO1 to 8 then you canuse this method. When switch is off the 10K resistor will keep the IO pin high, When switch ispressed on the switch will ground the IO pin. You can use digital input command to read this status.Board#1169IOxIOx readas digitalinputcommand+5V OUTGND10KLED – Any IO can be connected with LED like below. You can use digital output set high/lowcommand to set status of LED.Board#1169IOx is setHigh/low asPer commandfrom PCIOx+5V OUTGND 470Buzzer – Self Oscillating type buzzer(piezo or coil type) can be connected to any IO. If using coiltype buzzer, a diode should be used across buzzer to discharge its coil of high voltage duringoperation. In following diagram making a pin low will cause the buzzer to sound. Making an IO highwill switch off the buzzer. Alternately you can also connect buzzer between IO and GND pin.Board#1169IOx is setHigh/low asPer commandfrom PCIOx+5V OUTGNDMeasure Temperature using LM35 Sensor- LM35 is a temperature sensor will gives analogvoltage for 10mV per degree Celsius. At 25°C you get 250mV output analog voltage. If you read thevoltage with the board using analog read command you will get for example 0.250V output.Since the sensor outputs analog voltage the wire connect to sensor & board cannot be more than 2meters. In next method we will show how to measure temperature at over distance of 300 feet usingCAT5 cable and DS18B20 temperature sensor.Board#1169IOx readsAnalogVoltageIOx+5V OUTGND4Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com
Measure Temperature using DS18B20 Temperature SensorBoard#1169IOx readsTemperaturefromDS18B20IOx+5V OUTGND1KDS18B20 can be connected to measure temperatures from -55°C to +125°C (-67°F to+257°F) with ±0.5°C Accuracy from -10°C to +85°CUp to eight DS18B20 digital temperature sensors can be connected to the board. The length ofcable can be upto 300 feet(100 meters). For best performance, use Cat 5 type computer cable(alsocalled Ethernet/LAN Cable) to connect the sensors to the board. Two pairs of wires in the Cat 5cable are required for the connection. The first pair is for Power (5V) and Ground, and the secondpair is designated as <strong>Data</strong> and Ground. In addition, a pull-up resistor is required for the data line ofapproximately 1K Ohms.Reading Temperature will return valid temperature data if a temperature sensor is connected to thespecified I/O port. If no sensor is connected, a Temperature command will always return 999.99°.Cat5 cable lengths of greater that 100 feet may require a pullup resistor value of less than 1K Ohmsin order to achieve usable rise times at the sensor. The minimum safe resistance for the pullupresistor is 240 Ohms.Sending read temperature command will returns current temperature in Celsius and FahrenheitExample reading: 31.8°C 89.24°F4-20ma Current Loop - Many industrial systems uses current signals to monitor certain devices(like pressure sensors, gas detectors, temperature sensors). The signal is transported over 2 wires.The advantage of working with currents is a current always remains the same, no matter what thelength of a wire is.Most sensors can output a current signal between 4 and 20 mA. A signal lower than 4mA, typicallyindicates an error.This method below allows you to log a 4 - 20mA signal coming from a sensor. The 4-20mA currentis converted into voltage in range of 0-5V. Read analog values on the channel where this signal isconnected. When the current is 4mA the board will read analog voltage as 0.88V, When the currentis 20mA the board will read 4.4VBoard#1169IOx configuredfor AnalogVoltageReadingIOx+5V OUTGND220R+4-20 mASource orSensor-5Sunrom Technologies Your Source for Embedded Systems Visit us at www.sunrom.com
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USB Based 8-Channel Data Acquisition Module Features Applications

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