Hi,
On one hand, the US5881 Hall Effect sensor (sold on AdaFruit WebShop) does not appears to work with 3.3 volts as power supply (cfr tech sheet).
On the other hand, Raspeberry GPIO are not 5v Friendly.
The US5881 usually use a pull-up resistor of 10K to +5v, the US5881 will pull-down the voltage to GND when activated.
See http://mchobby.be/wiki/images/thumb/a/a ... ontage.jpg for schematic.
For Raspberry PI, I would propose to build a resistor bridge with an additional 20K resistor between the Output Pin of US5881 and GND.
By acting like that, Output voltage should be 3.3v (when sensor not activated) or 0v (when the activated sensor pulls down the voltage to GND).
Am I right?
Regards,
Dominique
Hall effet sensor on PI
Moderators: adafruit_support_bill, adafruit
Forum rules
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
2 posts • Page 1 of 1
Hall effet sensor on PI
by MCHobby » Sun Nov 04, 2012 6:49 pm
- MCHobby
- Posts: 15
- Joined: Tue Jan 24, 2012 2:14 pm
-
adafruit - Posts: 10485
- Joined: Thu Apr 06, 2006 3:21 pm
- Location: nyc
2 posts • Page 1 of 1
Return to Adafruit Raspberry Pi® accessories
Who is online
Users browsing this forum: No registered users and 1 guest
Stuff to buy from the Adafruit store and links to product documentation!
New Products [100]
Raspberry Pi[80]
FLORA[23]
Bunnie Studios[9]
FPGA[1]
mbed[11]
Arduino[60]
NETduino[14]
BeagleBone[24]
Android[6]
XBee[10]
More Dev Boards[30]
BoArduino[8]
SpokePOV[4]
TV-B-Gone[4]
MiniPOV[3]
SIM reader[3]
Microtouch[5]
Clocks & Watches[18]
Drawdio[4]
Brain Machine[1]
Game of Life[2]
MintyBoost[2]
More DIY Kits[16]
MaKey MaKey[3]
Tweet-a-Watt[5]
Young Engineers[33]
Discover Electronics[2]
Snap Circuits[4]
littleBits[3]
Project packs[8]
Breakout Boards[33]
LCDs & Displays[48]
Components & Parts[69]
Batteries & Power[49]
EL Wire/Tape/Panel[52]
LEDs[108]
Wireless[14]
Cables[60]
Lasers[6]
Sensors/Parts[145]
Enclosures/Cases[11]
Solar[11]
RFID / NFC[13]
Prototyping[69]
iDevices[13]
Tools[71]
Wearables[39]
CNC[37]
Robotics[29]
3D printing[1]
Materials[24]
Stickers[41]
Skill badges[55]
Books[25]
Circuit Playground[7]
Gift Certificates[4]
Raspberry Pi[80]
Displays [12]
Books [3]
Cables [12]
Accessories [10]
Boards & Packs [6]
Prototyping [7]
Cases [15]
Essentials [15]
Arduino[60]
More Dev Boards[30]
More DIY Kits[16]
LCDs & Displays[48]
Character [12]
VFD [2]
Graphic TFT [6]
HDMI/VGA/NTSC/PAL Displays [3]
Other [1]
OLED [5]
Graphic LCD [6]
eInk / ePaper [3]
NTSC/PAL TFTs [7]
Graphic LED [3]
Heat Sinks [4]
Passives [5]
Storage [7]
Sockets/Connectors [8]
IC & Transistors [13]
Other [14]
Header [6]
Switches & Buttons [12]
Cables & Adapters [13]
LiIon & LiPoly [8]
Wall Adapters [6]
Power Converters [4]
Battery Holders [11]
Power Switch [3]
Batteries [4]
EL Wire [12]
Flowing EL Wire [3]
Flowing USB Cables [6]
EL Starter Packs [5]
EL Tape [8]
EL Panel [5]
Inverters & Extras [13]
Cables[60]
Sensors/Parts[145]
Biometric [3]
Buttons & Switches [39]
Radiation / Geiger [2]
Liquid/Flow [4]
Barometric / Pressure [2]
Money / Coin [2]
Sound [2]
Location (GPS) [6]
Camera [2]
Movement [6]
Touch [22]
Temperature [17]
Light/Photo [6]
Humidity [6]
Proximity [17]
Other [9]
Prototyping[69]
Tools[71]