I want to know about project related to temperature sensor , like the temperature 80 degrees is sensed the it will send signal to FPGA and it should display "error" into seven segment display. and temperature sensor is connected to one machine and FPGA is connected to the generator, both the machines are connected to each other though for supply voltage. how to integrate both?? Please help...
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I have 3 XBee SMT Grove Development Boards. I configured two of them as coordinator and endnode respectively. Note that the end node is not connected to any intelligent computer via its serial interface. It is simply powered on and is configured to read an analog sample at regular intervals and transmit it to the coordinator.
My intension is to connect an analog sensor (example: Rotary angle sensor) and transmit the knob position at regular intervals to the coordinator (using the IO data sample indicator frame).
I connected the sensor to the AD3 slot of the end node. And end node reads a sample of data and successfully sends this value to the coordinator at regular intervals. However I noticed that for a position of approximately 0-150 degrees, the IO sample value as received at the coordinator seems to be (21-1023). Meaning, the value changes according to the knob position. But when I move the knob position further (the supported rotation range by the sensor is 0-300 degrees), from 150-300 degrees, I notice the value always remains constant(1023).
I know that 2 bytes of analog samples can be transmitted via this frame. And the IO sample of the sensor is also 2 bytes. So I am wondering why the value remains the same for half the position of the rotary where as for the first half it changes as expected ?
Please note that the sensor is already tested on a Grove Pi+ shield on a Raspberry Pi for correctness using the example code. It works perfectly throughout the whole range.
Thank you all for your time.
A while ago I successfully used a Sparkfun Polar Heart Rate Monitor Interface (SEN-08661) to convert a 'Spirit' cross trainer to pick up the Bluetooth signal from my Polar H10 chest strap instead of needing to use their proprietary wireless chest strap. (This was so I could use just one strap for both my phone and the machine).
The SEN-08661 interface board, often used with Arduino or Raspberry pi systems, receives the Bluetooth HR signal from the chest strap and outputs a simple 5v pulse for each beat, which I fed into the training machine in place of the receiver that was in there originally.
I now want to repeat this with a Lifefitness R1 recumbent bike but unfortunately it seems the SEN-08661 board is no longer available anywhere.
Does anyone know of a similar development board that I could use instead to pick up a Bluetooth HR signal from a Polar strap and output a pulse train?
Every search I do brings up loads of Bluetooth HR monitors but no Bluetooth HR receivers.
I realise this is not really a programming question but I'm hoping some programmers might know where to get the hardware (in the UK) from which to get the signal to process using programming!
Can I connect thermistor sensor to the analogue pin of XBee to read the human body temperature?
I want to get human body temperature through XBee.
Yes you can read temperature from a temperature sensor that is integrated with xbee but you also need another xbee that is connected to another microcontroller to read these values that are sent.
I'm using PIR sensor for motion detection and XBee s2c for transmission. The remote(transmitting) XBee, connected to PIR, is configured as below
CE=0
DH=0
DL=0
D4=3
IR=3E8 (500ms)
IC=FF (Change Detection on all pins)
The base(receiving) XBee is configured as below
CE=1
DH=0
DL=FFFF
D4=5
At the base, GPIO4 is connected to an LED. I have performed a simple test as mentioned here to check whether the GPIO is working or not. It's working as mentioned with above given DH & DLs. As D4 is configured to 5, the LED glows all time. Theoretically, whenever PIR sends high, LED should be off and vice-versa. But I am having two problems
The console of remote XBee is not showing any frames being sent but console of base XBee is showing the receiving frames and it is receiving correct data of PIR.
The pin D4 of base is not following the data being received i.e, it stays high all time.
I have observed the frames being received and they are showing the response of PIR as intended. How is the pin D4 not following the frames being received? I have followed this tutorial for DIO lines passing of XBee.
Make sure you're running the 802.15.4 (ATVR=0x20XX) or DigiMesh firmware (0x90XX) and not the ZigBee firmware (0x40XX). Looking at the options in XCTU, I don't think ZigBee firmware supports I/O line passing.
And looking at that knowledge base article, you might need to set ATIT on the remote and ATT4 and ATIA on the base. If those registers aren't available, then you're probably running a firmware version that doesn't support I/O line passing.
My problem is there was a spark when I plug in the voltage source of my 220 V bulb.I have my arduino uno r3,hc-05 Bluetooth Module,Relay Module and 220V bulb.
I cut the wire of my 220V Bulb.
One wire that is near to the bulb was connected to (COM)common connection of our relay.
The other cut was connected to ground.
The Relay Module's VCC was connected to Arduino's 5V.
The Relay's input pin was connected arduino's pin 13 as well as the Normally open(NO) pin of reay.The Relay's ground ws also connected to Arduino's ground.
My Bluetooth module tx was connected to aruino's rx ans Bluetooth module's rx was connected to tx.
I also connected Bluetooth Module,5v to the Arduino's 5v.
and A ground from Bluetooth module to Arduino's Ground.
I made my own version of schematic diagram and this is how it works.It is not that nice but I hoope you will understand.
The small squares serve's as the BreadBoard
https://twitter.com/n_galia/status/419876079403147264/photo/1
Here is a simple relay driver you can use with the Arduino. The component values are not super important, R4 could be larger, R3 can be larger, you can use just about any 5V relay and any NPN transistor. As show it should work with most low/medium sized relay. When active you can check the voltage between Q1's collector and ground. It should be less then a volt. About 4mA is provided by the Ardunio, far below it's output capacity.
PLEASE BE CAREFUL!! you are working with high current and high voltage power. Blowing up an Ardunio is minor compared to the damage you can do to yourself.
The revised schematic might not work either. If your relay is a basic relay a driver will be required. The Ardunio can only sink about 20mA and it's likely your relay will need more to function correctly. The relay coil might look like a short to the Arduino.
If you have a relay with a built in logic level driver or a solid state relay, or even a TRIAC part (not a relay) you might be OK.
In situations like this its advised to use an optical coupler between the Arduino and the relay.
The optical coupler has a transistor that will dive the relay in its output, the transistor is actually a light sensitive transistor (photo-transistor) which is turned on via an LED built into the package. The Arduino would drive this LED (though a limiting resistor) which would activate the transistor to drive the Relay. This way the low voltage electronics are totally protected and isolated from the high voltage stuff.
Ouch!
The Arduino is not compatible of dealing with your 220Vac lines from power and to the light.
Your Arduino may not function correctly anymore.
I have attached a revision to your wiring.