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RCWL-0516 - ita.ovh

Board header Pin Function 3V3 3.3V regulated output. Max 100mA (?) GND Ground OUT Trigger: high (3.3V) if motion detected. 0V normally. VIN 4 - 28V supply voltage


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Text of RCWL-0516 - ita.ovh

RCWL-0516RCWL-0516 microwave radar sensor module Human body induction switch module Intelligent sensor Features:1, transmission signal processing control chip RCWL-91962, wide operating voltage range: , compared with the traditional infrared feeling PIR, with the penetrating detection capability4, block time, distance adjustable5, output power supply Application Design Note:1, the sensing face in front of the gold without any , front and rear sensing surface space to set aside more than 1CM3, the module carrier plane and install as fat line4, a certain application of efective detection area5, the component side of the module is positive sensing face, the opposite is negative sensing surface. Negative sensing surface sensing less efective6, microwave modules can not be large-scale applications in the same area, otherwise there will be mutual interference. Between single individuals over distance greater than 1M RCWL-0516 is a doppler radar microwave motion sensor module which can act as an alternative to a PIR motion sensor. This git repository is an attempt to collect the rather scant information on this board in one unit I have was supplied by IC station (SKU 10630): (Use coupon code 'joeics' for a 15% discount).Operating frequency: The product specifcation omits the operating frequncy. I found a carrier at on my unit using a HackRF One SDR radio (see spectrum plot below). I suspect this frequency will vary from device to device: it would be difcult to have a tight specifcation with such asimple RF circuit on FR4 voltage: 4 - 28V. It provides a convenient output to drive a MCU (good for 100mA ?).The forward side of the board is the side with components. This side should face the objects being detected. Do not obstruct forward side with anything metalic. The back side should have clearance of more than 1cm from any regulated output. Max 100mA (?)GNDGroundOUTTrigger: high ( ) if motion detected. 0V - 28V supply voltageCDS(light sensor TODO)SchematicThe only schematic I could fnd is very low resolution and it's hard to make out some of the text. However I've been reverse engineering it and adding my are two parts to this schematic. A microwave frequency transmitter/receiver/mixer and a much lower frequency part based on an IC (marked RCWL-9196) which is very similar to the BISS0001 IC used in PIR motion the microwave part:The best explanation of how the microwave part of this works is in patent EP3091605A1. It describes as similar type of module operating at the heart of the RF is a Q1 a MMBR941M high frequency NPN transistor [5] in what is probably a Colpitt oscillator [6] confguration. The schematic above is misleading because it omits a key inductor and capacitors constructed from PCB traces (a microline inductor and capacitor). The inductor is the S curve trace on the top surface and capacitors are the ring structure on the bottom surface and also the rectangular block to the left of the S curve. Using the formula at reference [12] below I calculte the inductance of the S curve to be (very approximately) critical function of a doppler radar is to be able to 'mix' the refected signal with the transmitted signal to arrive at a frequency which is the diference between the transmitted and refected signal. In this board Q1 also cleverly assumes the function of the mixer: [TODO: this really needs to be explained].The low doppler frequency diference is extracted by a low pass RC flter (C9 1nF, R3 1k, fc 1/2 RC 160kHz) and amplifed by the RCWL-9196 IC and treated exactly the same as a signal from a PIR 4 Jan 2017: fnally found the signal at with the HackRF One SDR! One interesting observation: waving my hand in front of the sensor causes signifcant changes in the transmitting frequency, shifting by up to theory: the low frequency doppler shift causes small changes in the transistor base bias. I used spice simulations to verify that small changes to transistor base bias causes changes in oscillation frequency. By running a few simulations I estimate that 1 V change in bias will change oscillation frequncy by low frequncy partThe core of the low frequncy signal processing is an IC marked RCWL-9196. The schematic says (in chinese) that it's similar to a BISS0001 PIR IC. But there are diferences. Unfortunately I can't fnd any hard information (eg datasheet) on this. Now can I fnd any information on the brand/company name "RCWL".Pin numberBISS0001RCWL-91961A Retriggerable & non-retriggerable mode select (A 1 : re-triggerable) regulated output (100mA max?)2VO Detector output pin (active high)same3RR1 Output pulse width control (Tx)same?4RC1 Output pulse width control (Tx)same?5RC2 Trigger inhibit control (Ti)same?6RR2 Trigger inhibit control (Ti)same?7Vss Groundsame8VRF RESET & voltage reference input (Normally high. Low reset)Vin (4 - 28V)9VC Trigger disable input (VC > enable; Vc < disabled)same10IB Op-amp input bias current setting?11Vdd Supply regulated output (again?)122OUT 2nd stage Op-amp outputsame132IN- 2nd stage Op-amp inverting inputsame141IN+ 1st stage Op-amp non-inverting inputsame151IN- 1st stage Op-amp inverting inputsame161OUT 1st stage Op-amp outputsameAdjustment componentsOn the back of the board (the side without components) are pads for 3 optional components (0805 dimensions).PadFunctionC-TMRegulate the repeat trigger time. The default (unpopulated) time is 2s. A SMD capacitor to extend the repeat trigger time. Pin 3 of the IC emits a frequency (f), and the tigger time in seconds is given by (1/f) * 32678R-GNThe default detection range is 7m, adding a 1M resistor reduces it to 5mR-CDSthe VCC is in parrel connection with CDS(RCWL-9196 pin 9) through R-CDS. Connect the LDR at the R-CDS to turn of the detecting function at night. (?? TODO: make sense of this)Spice simulationI started with an example Colpitt circuit [9] and substituted the 2N3904 NPN with a MMBR941 (Spice model from [10]). I am using the Windows LTSpice from Linear Technologies (available as free download [11], also works with Linux under Wine emulator). See for a working Colpitt oscillator and for a model of the RCWL-0516 (however it does not oscillate!).Doppler efect calculationsIf ft is the transmitted frequency, fr is the refected frequency (as measured by the common transmit/receive antenna on the sensor), v is the speed of the target relative to the sensor (negative if receeding, positive if advancing toward sensor), c is the speed of light and fd (fr-fd) is the doppler shift, then:fr ft (c + v) / (c v)fd fr - ft 2v ft / (c v)If ( c << v) then fd 2v ft / cAssume typical human motion speed of v 1 m/s. ft , c m/s, then fd ** Example NOT tested : Log the output pin of a RCWL-0516 radar module to a 433 MHz XY-FST transmitter. */#include < >#defne PINRRADAR 2#defne PINRTX 9#defne PINRLED 13void setup() { (9600); pinMode(PINRLED, OUTPUT); vwRsetRtxRpin(PINRTX); // Arduino pin to connect the receiver data pin vwRsetup(6000); // bps connection speed}int rv -1;void loop() { digitalWrite(PINRLED, HIGH); int v digitalRead(PINRRADAR); if (v ! rv) { rv v; char msg[20]; sprintf(msg, "R %lu %d", millis() / 1000, v); vwRsend((uint8Rt *)msg, strlen(msg)); (msg); vwRwaitRtx(); // Wait to fnish sending the message } digitalWrite(PINRLED, LOW); delay(100);} more

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