سلام
مدار فرستندهamمیخواستم که به جای ماژول های فرستنده و گیرنده که برای ارسال دیتا بین 2میکرو استفاده میشوداستفاده بشه(گیرنده همان رادیوam باشه)
با تشکر
سلام
مدار فرستندهamمیخواستم که به جای ماژول های فرستنده و گیرنده که برای ارسال دیتا بین 2میکرو استفاده میشوداستفاده بشه(گیرنده همان رادیوam باشه)
با تشکر
سلام
دوست عزیز فرکانس ماژول ها از 315 مگاهرتز شروع میشه تا 915 مگاهرتز و رادیو آ ام از 525تا1625 کیلوهرتز است . با گیرنده رادیو ممکن نیست شما باید از مدلاسیون am با شیوه آشکار سازی am این کار رو . رو فرکانس بالا انجام دهید.
سلام،خیلی ممنون از پاسختان اگه امکان داره توضیح بیشتری بدین فرکانس کاری برام مهم نیست فقط میخوام با موج am دیتایی ارسال کنم از گیرنده هم اون دیتا رو دریافت کنم
با تشکر فراوان
با سلام، شما میتوانید از این ماژولها استفاده کنید:
DRA886TX و DRA886RX که اولی فرستنده و دومی گیرنده 433 مگاهرتز در باند AM است و مخصوص ارسال دیتا میباشد
سلام،خیلی ممنون از پاسختان اگه امکان داره توضیح بیشتری بدین فرکانس کاری برام مهم نیست فقط میخوام با موج am دیتایی ارسال کنم از گیرنده هم اون دیتا رو دریافت کنم
با تشکر فراوان
The given circuit diagram representing the receiver section of previous RF Remote Controller.
FET amplification circuit is used for a high frequency amplification circuit of the receiver. It is because the getting of parts is easy. So, it doesn't have high sensitivity. To make the receiver with high sensitivity, the circuit which used IC for FM receiver is good.
[*=left] High frequency amplification circuit
The 2 stages FET amplifier is used for the high frequency amplification. The FET amplifies only at the voltage to apply to gate (G). The resistor to be putting in the source (S) of the FET is to make the bias voltage of the gate. When making a resistance value big, voltage of the source goes up to the grounding and the bias voltage becomes big. In case of the gain of the amplifier is big, when the signal of the output returns to the input, an amplifier oscillates. In the case, it makes this resistance value big and the gain must be lowered. The power of the FET connects with the center tap of the coil (L2 and L3) to be putting in the side of drain (D). This is to make do operation to have been stable, improving the characteristic of the resonance circuit. The characteristic of the resonance circuit is called queue (Q). The ideal resonance circuit picks up only a resonant frequency. However, the actual resonance circuit becomes a shape like the mountain which made a resonant frequency a top. When the Q of the resonance circuit is high, the voltage at the resonant frequency becomes high and the resonant characteristic becomes good.
[*=left]Detection circuit
Rectifying the output of the high-frequency amplifier directly with Germanium diode and it makes the DC voltage from high frequency voltage. This circuit can get twice voltage compared with usual rectification circuit. Because the charging takes time when the value of the capacitor (C6) to use for input is big, the change of the output voltage becomes late. I decided a value of this capacitor by the cut & try.
[*=left]Relay drive circuit
RB5 and RB7 port of PIC make do the operation of the relays. It is converting the output voltage of PIC with the
transistor.It makes LED light up to find the operation of the relay. It puts a resistor in the LED in series and it is limiting the electric current which flows through the LED to about 10 mA. It is putting a diode in parallel with the relay. When the drive electric current of the relay passes away, the back electromotive force occurs to the coil of the relay. A transistor is prevented from the high voltage by passing the electric current of the back electromotive force to this diode. Because the relay to be using this time is small, there are few gravities that the transistor breaks even if it doesn't put a diode. I put it for the safety.
[*=left]Time Chart for Receiver
First, the receiver confirms that the electric wave exists. A 5-millisecond timer is set when an electric wave is received and the input signal becomes ON. The signal which is sent from the transmitter is a 10-millisecond interval. To detect ON/OFF in the position of the stable state, it is shifting for 5 milliseconds from the standing-up of the signal
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The control code does the electric wave of the transmitter to the control of ON/OFF. At design first, I examin the adoption of the frequency modulation (FM) method by the control code. However, I adopted an electric wave ON/OFF method because the circuit was simple. A control code is controlled by the software of PIC. With this, the control code can be easily changed. There are two purposes in
this control code. The 1st is to secure security. The FM electric wave which was modulated at the single frequency can be made with the other equipment, being easy. At the circuit this time, a control code with byte(8bits) is used. To recognize a control code, to detect a specific signal in front of it is needed. Also, it makes not recognize a normally control code when not detecting a normally signal more than one time. The 2nd is to change the kind of the control. The kind to control are designated by the contents of the byte. At the circuit this time, only two kinds of codes are used. More kinds can be controlled if changing the input circuit of the control.
Power switch and control code selection circuit
The operation of the circuit of the transmitter only when pushing a control switch. When a control switch isn't pushed, it makes all circuits stop. When a control switch isn't pushed, it makes all circuits stop to suppress the consumption of the battery cell. The control switch combines the selector switch of the control code and the power switch. A control switch is connected with the side of the positive of the cell and a power is supplied to the circuit even if it pushes any switch. Control code selection malfunction is prevented by the diodes.
Time Chart for Transmitter
I will show the time chart of the control code in the figure above. This composition is the composition which I contrived and is not standard composition. The switching time of each bit is 10 milliseconds.The signal to transmit from the transmitter is composed of three blocks. In the program, three blocks are managed by transmission status (TX_STATUS). ST0, ST1, ST2 show transmission status with the figure above. A bit in each block is managed by sub status (TX_SUBSTATUS). The figure which is written under the signal in the figure above shows sub status.
A control code is controlled by the software of PIC. With this, the control code can be easily changed. There are two purposes in
