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by yv1hx
Wed Mar 08, 2017 11:59 am
Forum: Automation, sensing and robotics
Topic: connect pyranometer to Rpi
Replies: 16
Views: 3964

Re: connect pyranometer to Rpi

No problem, the only thing I've found with this item is that id set up a test environment with a sensor signal generator that can output true voltages down to 1mv. Upon doing this it is not accurate on odd number voltages. so for 1mv it only reads 0.6mv but for a signal of 2mv it reads it dead on b...
by yv1hx
Tue Mar 07, 2017 6:38 pm
Forum: Automation, sensing and robotics
Topic: connect pyranometer to Rpi
Replies: 16
Views: 3964

Re: connect pyranometer to Rpi

I know this is an old thread but this is something I'm working on at the minute, I plan to use the ADCdiffPI from Abel electronics which when used single ended will give 17bits and 15micro volts per step which is a pretty good resolution, I plan on using the unpowered version from apogee so for eve...
by yv1hx
Fri Feb 24, 2017 4:59 pm
Forum: Automation, sensing and robotics
Topic: connect pyranometer to Rpi
Replies: 16
Views: 3964

Re: connect pyranometer to Rpi

I know this is an old thread but this is something I'm working on at the minute, I plan to use the ADCdiffPI from Abel electronics which when used single ended will give 17bits and 15micro volts per step which is a pretty good resolution, I plan on using the unpowered version from apogee so for eve...
by yv1hx
Sat Feb 04, 2017 5:18 pm
Forum: Automation, sensing and robotics
Topic: Weather Satellite Receiving Station
Replies: 19
Views: 16360

Re: Weather Satellite Receiving Station

I know this is an old thread but did anyone get software working to decode the signals. Have dedicated 137Mhz receiver, antenna etc, but would like to free up the windows computer for other things. Long time ago I downloaded from-i-dont-remeber-were a program called "wxapt". Quote from the help fil...
by yv1hx
Sat Feb 04, 2017 12:21 am
Forum: Automation, sensing and robotics
Topic: Weather Satellite Receiving Station
Replies: 19
Views: 16360

Re: Weather Satellite Receiving Station

I know this is an old thread but did anyone get software working to decode the signals. Have dedicated 137Mhz receiver, antenna etc, but would like to free up the windows computer for other things. Long time ago I downloaded from-i-dont-remeber-were a program called "wxapt". Quote from the help fil...
by yv1hx
Fri Jan 27, 2017 12:53 am
Forum: Español
Topic: Calibracion de sensores de humedad de bajo costo
Replies: 2
Views: 658

Re: Calibracion de sensores de humedad de bajo costo

actkk2000 wrote:Chas grax! :D

Slds!
A la orden!
by yv1hx
Thu Jan 26, 2017 5:11 pm
Forum: Español
Topic: Calibracion de sensores de humedad de bajo costo
Replies: 2
Views: 658

Calibracion de sensores de humedad de bajo costo

Articulo muy interesante acerca de la calibracion de sensores de humedad de terreno de bajo costo: El paper completo esta disponible aqui: http://www.mdpi.com/1424-8220/17/1/208 (En Inglés). Effective Calibration of Low-Cost Soil Water Content Sensors Heye Reemt Bogena * , Johan Alexander Huisman, B...
by yv1hx
Thu Jan 26, 2017 5:03 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Effective Calibration of Low-Cost Soil Water Content Sensors
Replies: 0
Views: 327

Effective Calibration of Low-Cost Soil Water Content Sensors

Interesting article about calibrating sensors: Effective Calibration of Low-Cost Soil Water Content Sensors Heye Reemt Bogena * , Johan Alexander Huisman, Bernd Schilling, Ansgar Weuthen and Harry Vereecken Institute of Bio- and Geosciences, Agrosphere Institute (IBG-3), Forschungszentrum Jülich Gmb...
by yv1hx
Fri Jan 06, 2017 5:57 pm
Forum: Weather station
Topic: Solar Radiation
Replies: 22
Views: 11402

Re: Solar Radiation

nrich wrote:I have a number (over 30) of used Kipp & Zonen pyranometers similar to ...snip....
Ned, I just drop you a PM a few days ago..
by yv1hx
Thu Nov 17, 2016 11:43 pm
Forum: Python
Topic: python code for dht11 sensor
Replies: 36
Views: 82629

Re: python code for dht11 sensor

... I'm not sure about the DHT11 pin, but the DS18B20 must be connected to the GPIO One-Wire enabled pin. ... Both the DHT11 and the DS18B20 may use any spare GPIO. Neither need to use GPIO 4. In the case of the DS18B20 use dtoverlay=w1-gpio,gpiopin=X to set the DS18B20 to use GPIO X. See /boot/ove...
by yv1hx
Thu Nov 17, 2016 2:09 pm
Forum: Python
Topic: python code for dht11 sensor
Replies: 36
Views: 82629

Re: python code for dht11 sensor

hi, i have dsb18b20 and dht11, one of the sensors uses gpio4 , is it a must to use gpio4 with temperature sensors? gpio4 is for clock pin. or which pin do you suggest for dht11 rather than gpio4. thanx. Hi, I'm not sure about the DHT11 pin, but the DS18B20 must be connected to the GPIO One-Wire ena...
by yv1hx
Tue Nov 15, 2016 7:19 am
Forum: Español
Topic: Sensor humedad suelo
Replies: 12
Views: 6926

Re: Sensor humedad suelo

Pues tenéis razón el Pi no tiene ADC, pero decía en las especificaciones 3.6V no se si los 3.3V de la Pi serán suficientes pero lo bueno es que tiene otro output de 5V. De la tabla Soil Moisture Sensor Probe Specifications , disponible en el enlace: https://www.vegetronix.com/Products/VH400/ : VH40...
by yv1hx
Sun Nov 13, 2016 11:19 pm
Forum: Español
Topic: Sensor humedad suelo
Replies: 12
Views: 6926

Re: Sensor humedad suelo

raspdroid wrote:[...snip...] además a 5V consume menos de 7mA por lo que es compatible con la Raspberry Pi. [...snip...]
Recuerda que siempre necesitarás un Convertidor Analogico Digital para hacer que la RasPi entienda esas magnitudes ;)
by yv1hx
Mon Oct 31, 2016 3:17 am
Forum: Other programming languages
Topic: WRF & NetCDF on Raspberry-Pi
Replies: 24
Views: 9859

Re: WRF & NetCDF on Raspberry-Pi

In my excitement, I forgot to mention one other thing, our intention (I'm working on this with a friend) is to run the WRF on a cluster of Pi's. Our idea is to get between 24 or 32 Pi's to build the cluster and then run WRF on it (it depends on our budget). We already have WRF running on a non-arm ...
by yv1hx
Sun Oct 30, 2016 5:55 pm
Forum: Other programming languages
Topic: WRF & NetCDF on Raspberry-Pi
Replies: 24
Views: 9859

Re: WRF & NetCDF on Raspberry-Pi

Hi yv1hx, did you managed to compile WRF on a Raspberry Pi? Interesting to know how you managed to do it if you did. Thanks! Nop, I cannot compile the WRF on the Raspberry Pi. As far as I can remember, the package needs an Intel processor, also in the case I can manage to compile, I suspect that wo...
by yv1hx
Thu Oct 27, 2016 6:33 pm
Forum: Other programming languages
Topic: PHP date_diff() Function error
Replies: 3
Views: 1423

Re: PHP date_diff() Function error

scotty101 & rpdom : Thanks you soo much, both methods worked for me, here is the final code: <?php ////////////////////////// // Time Span calculator // ////////////////////////// // https://www.raspberrypi.org/forums/viewtopic.php?p=1059318#p1059318 ////////////////////////// // Calculator Variabl...
by yv1hx
Thu Oct 27, 2016 2:37 pm
Forum: Other programming languages
Topic: PHP date_diff() Function error
Replies: 3
Views: 1423

PHP date_diff() Function error

Hello to all, I need to calculate the difference between different dates in PHP in days, I have seen a bunch of examples on the net, more or less like this: http://www.w3schools.com/php/func_date_date_diff.asp , for an unknown reason I cannot duplicate the results on my Raspberry, this is the code t...
by yv1hx
Wed Oct 05, 2016 4:23 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: read analog inputs higher than 3,3V using MCP3008
Replies: 7
Views: 8136

Re: read analog inputs higher than 3,3V using MCP3008

Hi. Were you able to do it? I am in the exact same situation, have a RPi 3, bought the pH/ORP converter from Phidgets, and I now want my RPi to be able to read the input value. I have my RPi hooked up with a lot of sensors such as Temperature, Light, Camera, etc. but this one is just too hard for m...
by yv1hx
Fri Sep 09, 2016 6:35 pm
Forum: Automation, sensing and robotics
Topic: DS18B20 5V external power with 3V3 dataline
Replies: 6
Views: 3342

Re: DS18B20 5V external power with 3V3 dataline

Hi, I used to have my DS18B20 operating with my RasPi continuously about a year and half gathering the ambient temp in the room while was installed my RasPi, with any glitches. My line between the RasPi ant the temp sensor was about 30 ~ 40 cms, twisted wire, BTW be sure to use good quality twisted...
by yv1hx
Thu Sep 08, 2016 5:30 am
Forum: General discussion
Topic: Software Defined Radio
Replies: 15
Views: 37706

Re: Software Defined Radio

I follow a lot of the electromagnetic spectrum including light Unless you're living on top of Mauna Kea where the only ground-based infrared telescope is located, you're missing one important part of the spectrum. I'm waiting to be scheduled for flights aboard the NASA and DLR (the German version o...
by yv1hx
Sat Sep 03, 2016 6:36 pm
Forum: Weather station
Topic: Solar Radiation
Replies: 22
Views: 11402

Re: Solar Radiation

Acrylic plastic is mostly transparent at UV range, just get as thin as possible, 3mm is too thick, I tried. I just got some microscope cover slips, very thin glass, still to try. But I am only using an i2c Lux sensor not a UV one. BTW, Good Idea the use of microscope glasses, I will give a try. The...
by yv1hx
Sat Sep 03, 2016 6:25 pm
Forum: Weather station
Topic: Solar Radiation
Replies: 22
Views: 11402

Re: Solar Radiation

I can't help with the circuit, but there are a few pre-wired uv sensor modules available. These contain a gallium nitride photo diode to measure uv in the approx range 200-300nm, plus opamp and a few other components. The circuit outputs a linear regulated voltage 0-1V, corresponding to a uv range ...
by yv1hx
Sun Jul 10, 2016 5:08 pm
Forum: Automation, sensing and robotics
Topic: DS18B20 5V external power with 3V3 dataline
Replies: 6
Views: 3342

Re: DS18B20 5V external power with 3V3 dataline

Hi, I used to have my DS18B20 operating with my RasPi continuously about a year and half gathering the ambient temp in the room while was installed my RasPi, with any glitches. My line between the RasPi ant the temp sensor was about 30 ~ 40 cms, twisted wire, BTW be sure to use good quality twisted ...
by yv1hx
Fri Jun 24, 2016 6:56 pm
Forum: Español
Topic: Otro articulo arbitrado acerca de la Raspberry PI
Replies: 3
Views: 602

Re: Otro articulo arbitrado acerca de la Raspberry PI

Saludos amigos,

Muchas gracias por sus palabras.

En los tiempos que corren actualmente en mi valpuleado país, hasta escribir un artículo cientifico es una gran odisea :(

De nuevo, muy agradecido.
by yv1hx
Mon Jun 20, 2016 6:59 pm
Forum: Español
Topic: Otro articulo arbitrado acerca de la Raspberry PI
Replies: 3
Views: 602

Otro articulo arbitrado acerca de la Raspberry PI

Saludos estimados, Aca les dejo otro articulo arbitrado acerca de la Raspberry Pi de mi autoria: "USO DEL MINICOMPUTADOR DE BAJO COSTO “RASPBERRY PI” EN ESTACIONES METEOROLÓGICAS" Resumen El objetivo de este trabajo es una propuesta para utilizar del minicomputador “Raspberry Pi”, como controlador d...

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