Portable Control & Measurement Device Supervisor: Boaz Mizrachi (Zoran)‏ 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  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_detect Mcu_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: פישבך קומה 13 פישבך קומה 1

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 Report Device No./ Sensors IR Temperature Buzzer Pressure Accelerometer Microphone SD UV Magnetic Optic Debugged Not-debugged

Project B Gantt