433 mHz LNA for Receiver and Freezer Temp Sensor

[patt896]

I'm trying unsuccessfully to find a sensor or receiver that will RX/TX thru refrigerator doors.
Thought about an LNA. May need an attenuator; 3 dB, 6 dB?
Ordered one from eBay.
http://www.ebay.com/itm/271883055390?_t ... EBIDX%3AIT

Anyone tried one on a receiver?

Richard

[patt896]

Alternatively, the sensor could be modified with an 2 Watt amplifier.
On eBay:
BLT53A 433MHZ power broadband 2W RF power amplifier high gain with Heat Sink
http://www.ebay.com/itm/BLT53A-433MHZ-p ... SwEjFXfhV8

Richard

[patt896]

So far I've tested:
Receivers:
Aurel
Oregon Scientific (poached)
SYN480R
On order:
RXB6
Qiachip

Sensors:
Oregon Scientific THGR800
Acurite V2
Ambient F007TH

No luck.

But the Ambient console receives both refrigerator and freezer sensors.

Richard

[patt896]

Or, I could modify the sensor and remote the antenna.

Or locate a sensor with a probe.

Richard

[patt896]

Or:
modify the sensor and remote the temp probe...

[patt896]

For antennas, I've tried:
17.3 mm vertical, helical, dipole, with and without 100x100 mm aluminum ground plane.

[patt896]

And, I will poach the receiver from an Ambient console since I know it works.

But in fairness, it may not work with RFLink.

[DA-Makes]

I have been monitoring fridge temperatures for a couple of years now using Jeenodes and the 1wire temperature sensor. The 868mhz jeenode has the antenna wire as part of the kit.

One thing I learnt quickly was that I wanted to use batteries to power the jeenode, standard AA batteries in a Fridge fail pretty fast, I had to use Duracell ulta power and they last over a year per set.

I'm trying unsuccessfully to find a sensor or receiver that will RX/TX thru refrigerator doors.
Thought about an LNA. May need an attenuator; 3 dB, 6 dB?
Ordered one from eBay.
http://www.ebay.com/itm/271883055390?_t ... EBIDX%3AIT

Anyone tried one on a receiver?

Richard

[patt896]

Thanks. New to me. Have to check that out asap.
I did find another recommended receiver:
https://www.disk91.com/2013/technology/ ... r-in-test/
Quasar QAM-RX1-433
http://fr.rs-online.com/web/p/modules-r ... m=742-4481&

[patt896]

I am familiar with Jean-Claude Wippler. But before I look very far into this, a couple questions come to mind.
I'm assuming that Domoticz handles multiple instances of RFLink Atmega 2560s.
I suppose I need another at 868mhz?

[patt896]

p.s., why is it called Domoticz when Domotica is Sp for Home Automation.

Dumb question from an ugly American.

Richard

[costo]

I am familiar with Jean-Claude Wippler. But before I look very far into this, a couple questions come to mind.
I'm assuming that Domoticz handles multiple instances of RFLink Atmega 2560s.
I suppose I need another at 868mhz?

Yes Domoticz (a nice name I think) can handle multiple RFLink boards. I have experimented with a 433MHz and a 315MHz connected by USB to a raspberryPi with Domoticz.

I experienced that when the 2 RFLink's are close together that the transmitting of one would be received/decoded at the other RFLink creating lots and lots of new devices because they were often not precisely decoded. I used fairly good receivers on both but the frontend of most (all?) AM/ASK/OOK receivers have a lack on selectivity and are overloaded easy, causing the receivers to respond/decode out of band signals if they are strong.

[patt896]

Hacked an OS THGR800 and added a remote 433 MHz dipole. Works fine.

Also found MySensor Arduino Nano + NRF24L01 + DS18B20.

[patt896]

Here are the links:
https://forum.mysensors.org/topic/2607/ ... frigerator
https://www.youtube.com/watch?v=2vAYAbtQfjs

[patt896]

And, check this out:
• HopeRF's RFM23BP are highly integrated, low cost,433/470/868/915MHZ wireless ISM transceivers module. The low receive sensitivity(?120dBm) coupled with industry leading +30dBm output power ensures extended range and improved link performance. Built-in antenna diversity and support for frequency hopping can be used to further extend range and enhance performance. Additional system features such as an automatic wake-up timer, low battery detector, 64 byte TX/RX FIFOs, automatic packet handling, and preamble detection reduce overall current consumption and allow the use of lower-cost system MCUs. An integrated temperature sensor, general purpose ADC, poweron-reset (POR), and GPIOs further reduce overall system cost and size.
• The RFM23BP digital receive architecture features a high-performance ADC and DSP based modem which performs demodulation, filtering, and packet handling for increased flexibility and performance. The direct digital transmit modulation and automatic PA power ramping ensure precise transmit modulation and reduced spectral spreading ensuring compliance with global regulations including FCC, ETSI. An easy-to-use calculator is provided to quickly configure the radio settings, simplifying customer's system design and reducing time to market.
           
Features:
              1. Frequency Range:433/868/915MHz ISM bands
              2. Sensitivity = ?120 dBm
              3. Output power range: +30 dBm Max (RFM23BP)
              4. Low Power Consumption: 25 mA receive; 550 mA @ +30 dBm transmit
              5. Data Rate = 0.123 to 256 kbps
              6. FSK, GFSK, and OOK modulation
              7. Power Supply = 3.3 to 6 V
              8. Ultra low power shutdown mode
              9. Digital RSSI
              10. Wake-up timer
              11. Auto-frequency calibration (AFC)
              12. Power-on-reset (POR)
              13. Antenna diversity and TR switch control
              14. Configurable packet handler
              15. Preamble detector
              16. TX and RX 64 byte FIFOs
              17. Low battery detector
              18. Temperature sensor and 8-bit ADC
              19. ?40 to +85? temperature range
              20. Integrated voltage regulators
              21. Frequency hopping capability
              22. On-chip crystal tuning
              23. Low cost
           
Applications:
              1. Remote control Home security & alarm
              2. Telemetry Personal data logging
              3. Toy control
              4. Tire pressure monitoring
              5. Wireless PC peripherals
              6. Remote meter reading
              7. Remote keyless entry
              8. Home automation
              9. Industrial control
              10. Sensor networks
              11. Health monitors
              12.Tag readers

Pasted from <http://vi.vipr.ebaydesc.com/ws/eBayISAP ... escgauge=1>

[patt896]

Why bother:
I have two refrigerators and never enough freezer space.
US FDA recommends that meat be stored at 0 F.
Chicken and beef satay fresh for 90 days at 25 - 30 F without significant bacterial growth (according to recent US AG studies).
Fine with me.
US FDA recommends meat be cooked @ 164 F for 4 min. By then it is dry and tough.
With Sous Vide, meat (beef and chicken) can be safely cooked at between 133 - 145 F for one
to four hours. And it remains tender and moist.
I turned down the fridge temp and it maintains 20 - 25 F.

[patt896]

p.s., @ 25 F your ice cream will resemble a Milk Shake.

[patt896]

Found a new receiver:

HopeRF RFM69W Transceiver Module - 433Mhz Version

Product Overview:
The RFM69W is a highly integrated RF transceiver capable of operation over a wide frequency range, including the 433, 868 and 915 MHz license-free ISM (Industry Scientific and Medical) frequency bands.Its highly integrated architecture allows for a minimum of external components whilst maintaining maximum design flexibility. All major RF communication parameters are programmable and most of them can be dynamically set. The RFM69W offers the unique advantage of programmable narrow-band and wide- band communication modes without the need to modify external components. The RFM69W is optimized for low power consumption while offering high RF output power and channelized operation.

Features:
• +13 dBm Power Output Capability
• High Sensitivity: down to -120 dBm at 1.2 kbps
• High Selectivity: 16-tap FIR Channel Filter
• Low current: Rx = 16 mA, 100nA register retention
• Programmable Pout: -18 to +13 dBm in 1dB steps
• Constant RF performance over voltage range of chip
• FSK Bit rates up to 300 kb/s
• Fully integrated synthesizer with a resolution of 61 Hz
• FSK, GFSK, MSK, GMSK and OOK modulations
• Built-in Bit Synchronizer performing Clock Recovery
• 115 dB+ Dynamic Range RSSI
• Automatic RF Sense with ultra-fast AFC
• Packet engine with CRC-16, AES-128, 66-byte FIFO
• Built-in temperature sensor

Pasted from <http://vi.vipr.ebaydesc.com/ws/eBayISAP ... escgauge=1>

[patt896]

Off Topic.
Some in my family, after genealogical study, claim that Pattens are descended from Dutch; translated Shoe Maker.

Others claim that we're Irish; translated Horse Thief.

[patt896]

Update on my heritage.

Pennsylvania Dutch and Amish share a charactic of mine.

We have gaps in our front teeth.

[patt896]

Heritage update.

My maternal great grandmother, whom I met only once, at the age of two, was a red headed Alsatian Jew.

[Stuntteam]

Okay, but how is that related to a freezer temperature?
Perhaps it is better to put your data into some genealogical database?

[patt896]

Darwin was right.

Think twice before discounting American Hybrids.

[patt896]

Sry, un-called for remark.

But UK, FR DK, would not fit within TX.