CPU – Page 2 – Experimental Engineering

Posted on October 20, 2010 by The Engineer — 1 Comment

Co-Op Bank Card Reader

This is a little security measure you get with Internet Banking with the Co-Op, generates codes to confirm your identity using your bank card. About the size of a pocket calculator, this is the keypad & screen.

The rear of the unit, the card slots into the top, manufactured by Gemalto Digital Security.

Outer back cover removed, showing the 8 contacts for the chip on the bank card, the 2 contacts below that switch on power when a card is inserted. Power comes from 2 lithium coin cells in the compartment on the lower left.

PCB removed from the casing, showing the internal components. Two large pads at top left are battery connections, while the only IC on the board is the main CPU, under the card connector. 6MHz oscillator & 32Khz crystal on board for processing & timekeeping. LCD screen connection at far right.

Reverse side of the PCB, with the keypad contacts. LCD on right, with programming interface pads at side of keypad.

Posted on August 26, 2010 by The Engineer — Leave a comment

Motorola V360v

Here is a more modern phone, the Motorola V360v. Features include Dual screens, 640×480 VGA camera, full col

our TFT Main LCD, SD-Micro slot.
Here on the back the grey scale LCD can be seen, with the camera lens to the right of the Motorola logo

Here the phone is opened showing the keypad & the full colour TFT LCD display.

Here the battery is removed from the unit, showing the SIM connector. The antenna cover is still on at the bottom.

The antenna cover has been removed in this shot, the antenna is the white section at the bottom, With the loudspeaker & the external antenna connector hidden at the right.

Here is the main PCB. Parts from left are the Bluetooth module at the top, supplied by Broadcom, the SD Card socket at the bottom. Main CPU next to that is the Freescale SC29343VKP. Above right of the CPU is the Freescale SC13890P23A Charger, Power & Audio IC. Below is the SIM card socket. Under the main CPU is the Intel Flash memory IC. ICs inside the shields are the RF sections for transmit & receive.

Rear of the display unit showing the monochrome LCD. The camera module on the bottom left. Ear speaker on the far right of the unit.

Main colour TFT LCD.

Camera module removed from the LCD unit.

The vibration motor attached to one of the LCD looms.

Posted on August 26, 2010 by The Engineer — Leave a comment

Nokia 7110

Another phone from the mid 90s. This is the nokia 7110.

Here the slider is open showing the keypad.

Here the battery is removed, a Li-Ion unit.

The battery cell & protection circuit removed from the casing.

This is the rear of the PCB removed from the housing. Data & charging ports on the right hand side f the board.

Front of the PCB with the RF sections at the left hand side & the keypad contacts on the right.

Closeup of the RF sections of the board, big silver rectangular cans are VCO units.

Closeup of the top rear section of the PCB, with SIM cnnector, battery contacts, IR tranciever at the far left. Bottom centre is the external antenna connector.

The logic section of the board, Large chip is CPU, to right of that is the ROM storing the machine code. Other chips are unknown custom parts.

The Mic & the loudspeaker removed from it’s housing.

LCD from the front of the unit, SPI interfaced. Flex PCB also contains the power button, loudspeaker contacts & a temperature sensor.

The scroll wheel removed from the front housing.

Tiny vibration motor removed from the rear housing, alerts the user to a text or phone call.

Posted on August 5, 2010 by The Engineer — Leave a comment

HP Photosmart 375

This is a HP PhotoSmart 375 portable photo printer. With built in card reader, screen & PictBridge.
Top of the printer showing the UI Buttons & Screen.

Front of the unit, card reader slots at the top, Pictbridge USB connector at top left. Paper out slot at bottom. Cartridge door is on the right.

Here the cartridge door is open. Takes HP 95 Tri-Colour Inkjet Cartridge.

Battery compartment on the bottom of the unit. A Li-Ion battery pack can be installed here for mobile photo printing.

Specifications label.

Power adaptor & USB connection for PC use.

Rear door opened. Showing the paper feed tray.

Rear door has been removed in this shot. Paper feed roller & platen roller can be seen here.

Paper holder attached to rear door.

Bottom of the top cover, with connections for the buttons & LCD panel.

This is the main PCB of the unit. Controls all aspects of the printer. CPU in center, card reader sockets are along bottom edge. various support circuitry surrounds the CPU.

Rear shell has been removed here. Showing the main frame & the carriage drive motor on the left.

Closeup of the carriage drive motor & timing belt system. All the motors in this printer are DC servo motors, not steppers.

Main drive motor, feeds paper, drives rollers, operates cleaning mechanism for the inkjets.

Mainshaft encoder. Main drive motor is bottom right hand side with timing belt drive.

Closeup of the CPU. This is a Phillips ARM chip, unknown spec.

Detail of the card reader sockets, this unit takes all current types of Flash memory card.

HP 95 Tri-color Inkjet Print Cartridge

Posted on July 31, 2010August 1, 2010 by The Engineer — 2 Comments

Current Cost ‘Envi’ CC128 Power Meter

This is the Current Cost CC128 Real Time Power Meter. Shown here is the display unit, British Gas issued these free to some customers.
This unit measures current power draw in Watts, cost of power currently being used (requires unit price to be set), overall kWh usage over the past 1, 7 or 30 days & power trends during the day, night & evening. Also displays current time & current room temperature.

Here the front panel of the display has been un-clipped. At the bottom are the RJ-45 serial port & power connections.
This unit uses a PIC micro-controller as it’s CPU (PIC18F85J90) Just above & left of the CPU is the 433MHz SPD radio receiver module. The chips on the right of the CPU are a 25LC128 SPI serial EEPROM for data storage & a 74HC4060 14 stage binary counter, to which is connected the 32kHz clock crystal. The red wire around the top of the display is the antenna for the radio receiver.

For more info on the CC128 in general, the serial port & software for computer data logging, see this link
See this link for Current Cost’s list of software

Closeup of the ICs on the mainboard.

Here we have the transmitter unit, with Current Transformer (CT). The red clamp fits around one of the electric meter tails & read the current going to the various circuits. This unit is powered by 2x D cells, rated at a life of 7 years.

The PCB inside the transmitter. Again very minimal design, unknown controller IC, 433MHz radio transmitter on right hand side with wire antenna. Two barrel connectors on left hand side of board allow connection of up to two more CT clamps for measurement of 3-phase power. Centre of board is unmarked header. (ICSP?)

CT unit. Inside is a coil of wire & an iron core which surrounds the cable to be measured.

PIC18F85J90