1. 7/10/2007 AIIT Summer Course - D# 1 Wireless Embedded Systems and Networking Lab Day 2: Part 1: Add your own external sensors Lab Assistant: Jaein Jeong University of California, Berkeley

2. 7/10/2007AIIT Summer Course - D#2 Magnetic Reed Sensor Study the resistance of the magnetic reed sensor open and closed. Discuss pull up, expected voltage and current.

3. 7/10/2007AIIT Summer Course - D#3 Connecting sensors to expansion port

4. 7/10/2007AIIT Summer Course - D#4 Configuring Switch Port. Enable Device. Name the states.

5. 7/10/2007AIIT Summer Course - D#5 Interrupt vs. Sampling Discuss interrupt versus sampling. Exercise 2-1: set the alarm on humidity.

6. 7/10/2007AIIT Summer Course - D#6 Using RTD Exercise 2-2: Study the resistance of the RTD in ice water versus room temperature versus tea. Ice Water Room Temperature Tea Resistance of RTD Temperature

7. 7/10/2007AIIT Summer Course - D#7 Concept of resistive sensors. Discuss voltage divider, reference voltage. Mapping readings to engineering units. Exercise 2-3: What value R comp should be set to? For a Primer Pack node, V ADC0 is between 0 to 4095 (12-bits). Internal to Sensor Node R th R comp VCC ADC0 VPU0

8. 7/10/2007AIIT Summer Course - D#8 ADC0 GND VPU0 Attach RTD to ADC port Connect one end to ADCx, the other to GND. Try with your own node. Internal to sensor node Wiring to sensor node

9. 7/10/2007AIIT Summer Course - D#9 Configure ADC port, resistor, reference 1.Enable Port to Use. 2.Configure Each Port.

10. 7/10/2007AIIT Summer Course - D#10 Measurement using a sensor node Conduct same measurements using a sensor node. –Measure temperature using the RTD connected to a node. –Try both in ice water versus in room temperature. Compare results to expectations.

11. 7/10/2007AIIT Summer Course - D#11 Conversion Pull data into excel using the data export facility and do the conversions. Raw ReadingTemperature Point 1 Point 2 Point 3 Point 4 Point 5

12. 7/10/2007AIIT Summer Course - D#12 A Sample Sensor Board Resistive sensor: photo resistor Voltage sensor: voltage divider with variable resistor Actuator: LED

13. 7/10/2007AIIT Summer Course - D#13 Sample Sensor Board 1K IO0 R comp : Programmable Potentiometer in Primer Pack Sensor Node R photo R comp (set close to 100K) VCC ADC0 VPU0 R v (0 – 100K) R pu (100K) R comp (set close to 0 Ohm) VCC ADC1 VPU1