User:ZdenekBroz/devices

Planned devices for the XO.

Devices will be connected to special unit powered by Atmel programmable CPU.

Here are some ideas for possible devices:

• Thermometer
• Voltmeter, ampermeter, ohmmeter
• Oscilloscope
• Photodiode
• PH meter

  See also the Digital Signal Processing page for work being done in India

Processor unit

processor type: C8051F321 - Full Speed USB, 16k ISP FLASH MCU Family - ETC CPU specification
cpu size: 6mm x 6mm
board size: 15mm x 30mm
case size: 20mm x 40mm (size similar to USB Bluetooth adapter )

Electrical scheme

Calculated price: CPU unit: cca 6$
board + additional electronic parts: 17$
connectors: 2$

Total price: 25$ (retail price)

CPU unit vs MicIn port

• Oscilloscope on the CPU unit can sample up to 1MHz
• CPU unit automatically switches range when measuring resistance, voltage and current
• CPU unit is much safer for the laptop (only CPU unit will be damaged). If protection on MicIn port fails then whole laptop or sound card is destroyed.
• CPU unit can switch ranges easily without any additional software or hardware
• CPU unit can supply 5V and 3,3V to connected sensors
• Oscilloscope can have more than one channel with the CPU unit

Sensors

Sensors will be connected to the CPU unit. The CPU unit will measure values from the sensors and feed them into application on the XO. (CPU can use every sensor that can convert measurement into voltage or current)

Planned sensors:

• Thermometer (cca 2$)
• Voltmeter, ampermeter, ohmmeter, oscilloscope (cca 1$)
• Photodiode (cca 2$)
• PH meter

(if you find cheap sensors please add them into this list)

All existing sensors (Technical details):

Accelerometers Low-g Accelerometer 25-g Accelerometer 3-Axis Accelerometer Barometer Blood Pressure Sensor Charge Sensor CO2 Gas Sensor NEW DESIGN Colorimeter Conductivity Probe Current Probe Differential Voltage Probe Digital Control Unit Dissolved Oxygen Probe Drop Counter Dual-Range Force Sensor EKG Sensor Electrode Amplifier Flow Rate Sensor Force Plate Gas Pressure Sensor Garmin® eTrex Venture Garmin® eTrex Vista Cx NEW Hand Dynamometer Hand-Grip Heart Rate Monitor Instrumentation Amplifier Ion-Selective Electrodes Calcium ISE Chloride ISE Ammonium ISE Nitrate ISE

Light Sensor Logitech QuickCam Pro 5000 Magnetic Field Sensor Microphone Motion Detectors Go! Motion Motion Detector CBR 2 O2 Gas Sensor NEW DESIGN Ohaus Balances ORP Sensor pH Sensor Photogate Radiation Monitors Radiation Monitor Student Radiation Monitor Relative Humidity Sensor Respiration Monitor Belt Rotary Motion Sensor Salinity Sensor Sound Level Meter NEW DESIGN Soil Moisture Sensor Spectrometers Spirometer Temperature Probes Stainless Steel Temperature Probe Go!Temp (computers only) EasyTemp (calculators only) Infrared Thermometer NEW Surface Temperature Sensor Extra-Long Temperature Probe Direct-Connect Temperature Probe Thermocouple Turbidity Sensor UV Sensors Voltage Probe Wireless Dynamics Sensor System

(please submit more ideas here)

Questions about this hardware

(please submit all your questions here so we can answer them - your feedback is VERY important)

Inner links

• Open Hardware
• Measure