Portable Control & Measurement Device

Yotam Vit Karinne Attali

Supervisor: Boaz Mizrachi (Zoran)

The PCD: Portable & user friendly

Low-priced

Versatile & multi-purposed

Measure and display results instantly

Store data for later re-evaluation

Control over environment

Customization and extension of feature-set in

HW & SW

While waiting for the new board…

• Gather and process the materials

• Self-learning process:

–PCD: PIC, Data sheets, schematics, HW & SW

–MPLab environment: ICD, debug & program

• Design and preparation of ICD connector Cable

• BOM & inventory management

!The new board has arrived• Assemble & HW debug

• Focus on “power circuit”

• Sensors debug and driver implementation

– Accelerometer

– Pressure

– Buzzer

• Multiple devices production

Power Circuit• Enables device “turn off” via “on/off switch”– SW open, EN=1.6V– SW closed, EN=2V– When “Pic” reads 2V it enforces logic ‘0’ on EN– DCDC 3.3V shuts down– No VCC to Pic -> device turn off

if ((shutSum/(double)i)>1.6) {if (dcdcOnOff==0) MCU_POWER_CHRG_CE=0{;

SW

EN

Mcu_power_shutdown_detectMcu_power_shutdown

Accelerometer

A micro-machined device measuring static acceleration.Output voltage alternates according to 3 dimensional axis.

Pressure

A silicon sensor measuring absolute pressure.Output voltage can be convertered to

pressure by:

קומה פישבך13

קומה פישבך1

Buzzer

An electronic audio device working by alternating on and off the signal source given by the PIC, thus creating different frequencies which give a big array of sounds.

for (b=0;b<9000;b++){}for (b=0;b<18000;b++){ if ((b%100)==0) MCU_AUX_BUZZER = !MCU_AUX_BUZZER;}for (b=0;b<9000;b++){}for (b=0;b<18000;b++){ if ((b%190)==0) MCU_AUX_BUZZER = !MCU_AUX_BUZZER;}

Multiple devices production• Common malfunctions:–Design mistakes–Assemble mistakes–Defective components–Short/open circuit –Borderline design–Unexpected high “Pic” resistant–Out of range “Pic” input voltages

Multiple devices production• Locate malfunctions:–Visual check–Voltage measure using Scope–Comparison to proper boards–Confirmation with “Data Sheet”–Resistant measurement w/o component–Disconnect (“lifting”) components (“legs”)–SW

Status Report6 5 4 3 2 1 0 Device No./ Sensors

IR

Temperature

Buzzer

Pressure

Accelerometer

Microphone

SD

UV

Magnetic

Optic

Debugged

Not-debugged

Project BGantt

Questions?