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1  Using Arduino / Networking, Protocols, and Devices / Re: Wiring multiple devices to Arduino through SPI on: July 20, 2014, 11:04:16 pm
the MISO/MOSI and slk can be multipule used, which the "SS" is the slave-select, to select which slave module the microcontroller want to communicate with...
2  Using Arduino / Sensors / Re: PIR Sensor - remove the 'delay' when detecting motion? on: July 18, 2014, 10:09:38 pm
there is 2 Adjustable resistor on the PIR sensor, have a try to adjust them.  the delay time do not have any relationship with the coding, do not waste time on the coding.
3  Using Arduino / Sensors / Re: Arduino mega2560 and MPU5060 sda and scl connections on: July 18, 2014, 10:05:45 pm
i do not think it is impossible. you can use the software I2C library, to make any pins to act like the I2C port: http://playground.arduino.cc/Main/SoftwareI2CLibrary
4  Using Arduino / Sensors / Re: GPS Module not working. on: July 18, 2014, 10:00:55 pm
okey, boy, give you a very simple to check if your GPS work, do not need Arduino or any code.
connect the gps to directly to your UART of computer, if your computor do not have a uart, just use a USB2UART convert, like the ch340 module orFt232 module , and then open the uart monitor .... the gps module will report.
As the gps module has a uart communication,  Arduino and any code is not essensital for your checking of the gps module itself.
5  Using Arduino / Project Guidance / Re: Use photoresistor to stop actuator. on: July 18, 2014, 09:39:54 pm
do not very clean about the detail you want .  do you mean you want to control the actuator from 0 to 180 depending on the ligtht intensity? if yes, just serial connect the photoresistor with a resistor , and then analog read the voltage between ,you will get the relative light intensity. but if you need the light intersity presicely, i suggest you use a digital light sensor, whose output has a much more bettter linearity with the light intensity.
6  Using Arduino / Project Guidance / Re: Small Bluetooth Device on: July 18, 2014, 09:32:12 pm
if your cellphone is BT2.0 , at least you will need : AC_DC  module, microcontroller such as Arduno, BT 2.0 module and an simple app to display information on your phone.  suggest the BT Bee module. , if your phone uses BT4.0, a BT4.0 module would work
7  Using Arduino / Project Guidance / Re: How to measure voltage from 12V battery on: July 18, 2014, 09:24:57 pm
 a voltage divider from seeedstudio would works. http://www.seeedstudio.com/depot/Grove-Voltage-Divider-p-1472.html?cPath=1_4
8  Using Arduino / Motors, Mechanics, and Power / Re: powering Arduino UNO r3 and Adafruit Motor Shield v2 on: July 16, 2014, 02:04:45 am
1. No, if you using USB power , the VIn on the Uno would be low, do not suffient for the motor shield.
2. Yes, the motor shield would generate a 5V for the system, equal to the USB power . actually, you can Remove the USB then.
9  Using Arduino / Motors, Mechanics, and Power / Re: Hbridge and motor Power on: July 16, 2014, 01:58:24 am
a H-Bridge shiled Schematic for your reference :http://www.elecrow.com/wiki/images/5/51/H-bridge_Shield.pdf

hope it helps.
10  Using Arduino / Motors, Mechanics, and Power / Re: MOSFET H-bridge Voltage too low. on: July 16, 2014, 01:46:52 am
i think you should firstly learn some basic usage of MOSFET to create H-bridge. the whold schematic is wrong. smiley-sad-blue
i suggest you take this schematic for reference: http://www.elecrow.com/wiki/index.php?title=Dual_Channel_H-Bridge_Motor_Shield
Hope it helps for you!
11  Using Arduino / Motors, Mechanics, and Power / Re: L298 question on: July 16, 2014, 01:39:58 am
@marcosmoura,
i think your problem is :
1. Your way to measure the drive cuttent is OK, but notice, as the drive current is large, you should use large Power resistor, such as Cement Resistor. as i do not see such a resistor on your module, i think you added it by yourself.  unplug the "current sense" jumper to add the resistor.
2. the driver IC would be very hot when drive current > 1.5A; and the voltage 20V is too high, suggest voltage <15V;
3. For the PWM, you can use the Arduino PWW library analogwrite(), but if you want the motor run steady , you shoud use a higer frequcy PWM.

at least , an alike Motr& stepper shield for your reference.
12  Using Arduino / Project Guidance / Re: custom PCB on: July 15, 2014, 11:36:39 pm
@ CrossRoads,
OK, as an elecrow member, here i intruduce you the elecrow PCB service:
1. if you care about the price:
 the 5cmx5 cm max , 10 pcs , color free--> 9.9$
 the 5cm x 10 cm max, 10 pcs , color free--> 12.9$
 the 10 cm x 10 cm max , 10 pcs , color free --> 15.9$,
and also special for green board: 10cm x10 cm, 10 pcs, green, only 12.9$
so, as the price, elecrow is good!

2. as the Stencil service:
the Laser Cut PCB Stencil service 20$, and the Stencil service without frame 20$ too, which would reduce the shipping fee greatly for customers.
3. as the other kinds of PCB service:
 Provide the 4 layer PCB, FPC, and high-quality PCB service.
13  Community / Exhibition / Gallery / Re: Say Hello with Roommate Mouse, with Arduino on: July 14, 2014, 01:46:40 am
seems not, the mouse play with the cheese, and eat some of them, and then the cheese fall down from the desk...
14  Using Arduino / Programming Questions / Re: Automated Greenhouse on: July 08, 2014, 06:08:03 am
the aip moisture is different soil moisture. the soil moiture sensor used in SPKloppers's project acts like a virable risistance, but @GoForSmoke it is not act as a "protensiometer", it's ristance changes with the moisture and then the current flow on it changrd slightly, with a Transistor and a  current sample resistor,  this changes get Recognizable by Arduino.
15  Using Arduino / Project Guidance / Re: Will this item work? on: July 08, 2014, 06:06:24 am
a CNC  Shield for Arduinofor your reference. smiley-razz
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