Test Specification

City of Glasgow College

HND Electronics Graded Unit Project

SARRRO

Gavin Hannah

N10161454

2012/13

HND Graded Unit Project – Gavin Hannah – SARRRO Test Specification

26 May 2013 2

This document provides details on test procedures for SARRRO. It should provide a reference for

anyone attempting to diagnose faults. It is split into three parts. These are:

+ Motherboard

+ Ultrasonic Emitters

+ Ultrasonic Receivers

Please consult this document before attempting any service or repairs. Further detailed information

regarding individual components can be found within the components’ individual data sheets.

HND Graded Unit Project – Gavin Hannah – SARRRO Test Specification

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Motherboard

Power Supply:

Battery Requirements - 7.2V – 9V, 2000mAh minimum

Test Point Parameter Specified Output 1 VDD ~5V

2 VSS 0V

3 Vsrc 7.2Vmin

MCU Nominal Operation

Test Point Parameter Specified Output OSC1 / OCS2 freq XTAL Freq, 20MHz

11/32 VDD 5V

12/31 VSS 0V

PORT PIN OUTPUT HIGH

VOH 5V

PORT PIN OUTPUT LOW

VOL 0V

PORT PIN INPUT HIGH

VIH 2V - 5V max

PORT PIN INPUT LOW

VIL 0V - 0.8Vmax

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Bluetooth Connection

Test Point Parameter Specified Output Parameter Test Point Specified Output

CONN-SIL 1 VDD, IDD 3V3, 50mA VH, VL 1 High = 5V, Low = 0V

CONN-SIL 2 VSS 0V VH, VL 2 High = 5V, Low = 0V

CONN-SIL 3 VH, VL High = 3V3, Low = 0V VH, VL 3 High = 5V, Low = 0V

CONN-SIL 4 VH, VL High = 3V3, Low = 0V VH, VL 4 High = 5V, Low = 0V

CONN-SIL 5 VH, VL High = 3V3, Low = 0V VH, VL 5 High = 5V, Low = 0V

CONN-SIL 6 VH, VL High = 3V3, Low = 0V

CONN-SIL 7 VH, VL High = 3V3, Low = 0V

CONN-SIL 8 VH, VL High = 3V3, Low = 0V

TEMPERATURE & HUMIDITY

SENSORS

* See Graphs At Back For Detailed Data.

Test Point Parameter Specified Output 1 VH, VL High = 5V, Low = 0V

2 T, Vo @25°C = 2.5V *

3 T, %RH, freq @25°C & 55%RH = 4.975kHz*

1

1 2 3

2 3 4 5

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H-BRIDGE

Test Point Parameter Specified Output PIN 9 VSS 5V

PIN 4 VS 7.2V (Vsrc)

PIN 5 VH, VL High = 5V, Low = 0V

PIN 7 VH, VL High = 5V, Low = 0V

PIN 10 VH, VL High = 5V, Low = 0V

PIN 12 VH, VL High = 5V, Low = 0V

PIN 6 VH, VL High = 5V, Low = 0V

PIN 11 VH, VL High = 5V, Low = 0V

PIN 1 Vsense 2.3Vmax

PIN 15 Vsense 2.3Vmax

PIN 2 Io Non-Repetative(100µs) = 3A, Repetative (80% on, 20% off ton = 10ms) – 2.5A,

DC operation 2A

PIN 3 Io Non-Repetative(100µs) = 3A, Repetative (80% on, 20% off ton = 10ms) – 2.5A,

DC operation 2A

PIN 13 Io Non-Repetative(100µs) = 3A, Repetative (80% on, 20% off ton = 10ms) – 2.5A,

DC operation 2A

PIN 14 Io Non-Repetative(100µs) = 3A, Repetative (80% on, 20% off ton = 10ms) – 2.5A,

DC operation 2A

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Ultrasonic Sensors

Ultrasonic Emitter

Test Point Parameter Specified Output

U1:A – 2 f 13 – 14kHz

U1:A – 1 VoH 11.95V

U1:A – 1 VoL 0V

Q2 B Vb 4.3 – 5V

Q2 C VeH 11.95V

Q2 C VeL 0V

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Ultrasonic Receiver

Test Point Parameter Specified Output

Q7 B Vb 3.1V

Q7 C Vc 7.2V

Q7 E Ve 2.6V

Q8 B Vb 3.1V

Q8 C Vc 7.2V

Q8 E Ve 2.6V All outputs are under quiescent conditions.

During Echo Detect( Test signal of 10mV applied to Vb Q7 )

Test Point Parameter Specified Output

Q7 Cpeak Vc 7.6V

Q8 Cpeak Vc 12V

D1 Cathode Vpeak detect 9V

Q1 B Vb 9V

Q1 E Vout 5V

HND Graded Unit Project – Gavin Hannah – SARRRO Test Specification

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Input Signal 10mV Peak

Vc Peak 7.6V

Vc Peak 12V

Oscilloscope output of circuit simulation

HND Graded Unit Project – Gavin Hannah – SARRRO Test Specification

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TEMPERATURE & HUMIDITY SENSORS

Ideal Temperature Sensor Plot

0

0.5

1

1.5

2

2.5

3

3.5

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41

Vo

lta

ge

Temperature

Output Voltage vs Temperature

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Humidity Sensor ;

For SARRRO, C represents a capacitive humidity sensor. tA can be calculated using the following

formula. See Data Sheets for in depth description of individual components.

40406B CMOS Schmitt Trigger Astable Setup

Vp = Positive Threshold Trigger,

TYP = 2.9V

Vn = Negative Threshold Trigger,

TYP = 1.9V

VDD = 5V

VSS = GND

Capacitive response of Humidity Sensor For HCH-1000-101

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SARRRO MOTHERBOARD

CONNECTOR TYPE DESCRIPTION ICSP PICKit Connector MOTORS Bi-Directional Motor connection

BLUETOOTH 1 – 3V3 : 2- GND : 3 – Connection status LED : 4 – BT Reset : 5 – Auto discover : 6 – Set 9600 Baud : 7 – MCU Rx : 8 – MCU TX

ULTRASONICS 1,2 – 7V2 : 3,4 – GND : 5 – Left Ultrasonic : 6 – Middle Ultrasonic : 7 – Right Ultrasonic : 8 – Ultrasonics Activate

USINPUT 1 – Ultrasonic Sensor Input : 2,3- NC - PIN 1 Must be disconnected during ICSP programming PWRIN / PWROUT -VE Negative Battery Terminal : +VE Positive Battery Terminal / +5V output : GND J1 / J2 Jumpers for ICSP. Must be removed during ICSP programming

J1

J2

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SARRRO ULTRASONIC EMITTERS

CONNECTOR TYPE DESCRIPTION

J1 1 – GND : 2 – PWR Supply : 3 – Left Emitter Activate : 4 – Middle Emitter Activate : 5 – Right Emitter Activate : 6 – 555 Activate

LS1 1 – Emitter Positive : 2 – Emitter GND LS2 1 – Emitter Positive : 2 – Emitter GND LS3 1 – Emitter Positive : 2 – Emitter GND

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SARRRO ULTRASONIC RECEIVERS

CONNECTOR TYPE DESCRIPTION J1 1 – GND : 2 – PWR Supply : 3 – Receiver Output Left Receiver 1 – Receiver Positive : 2 – Receiver GND Center Receiver 1 – Receiver Positive : 2 – Receiver GND Right Receiver 1 – Receiver Positive : 2 – Receiver GND

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Troubleshooting

I am unable to program SARRRO using the ICSP.

Make sure that the ICSP header pins are connected to the MCU /Chip holder. Test each pin with the

corresponding MCU pin to make sure full connectivity is present.

If a pin has no connection, inspect solder joints for dry solder joints or missing solder.

Nothing happens when I switch SARRRO on.

+ Check the battery has enough charge.

+ Check that the on/off switch is functioning.

+ Check the green on/off LED is fully lit.

Step 1 Checks - Check the external crystal oscillator is functioning

- Check capacitors C1 & C2 are functioning

- Inspect MCU chip holder solder joints for signs of deteriorated solder

Step 2 Checks - Check that the on/off LED is functioning

- Check that 5 - 5.3V is present at the cathode of 5.1V Z

- Check that the VDD pins of MCU are at 5 - 5.3V

- Inspect MCU chip holder solder joints for signs of deteriorated solder

If all above checks are exhausted, try replacing MCU with one that is known to be working.

The motors have stopped working.

+ Ensure MCU is operational.

+ Check that H-Bridge pin 4 (Vs) = Vsrc. Check that VSS = 5V.

+ Check that Diodes 2 - 9 are all functional. Replace any burnt out diodes.

+ If MCU is operational and Diodes 2 - 9 are fine, check that the H-Bridge is operational. Replace if

burnt out.

The Ultrasonics are not working.

+ Following the test point procedures, check that the 555 and LM386 chips are operational.

+ Check that all the passive components (Transistors, resistors, capacitors etc) are all functioning.

Replace any burnt out parts.

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The Humidity and / or Temperature Sensor(s) do not work.

+ Check for any burnt out passive components (Resistors, capacitors etc).

+ Check that the 4017 Schmitt Trigger is operational.

+ Check that the thermistor is not burnt out.

+ Inspect the humidity sensor for any signs of physical damage.

+ Replace any burnt out / blown parts.

+ Check that the MCU pin RB5 is high (+5V) during sensor activation. If pin is not high and MCU is

operational, check the MCU code for conflicts.