malawicarsten

malawicarsten

28 observations in 1 expeditions


Expeditions Contributed to

Recent Observations

Hi Sorry for not updating for long time, but too much work and not enough hours... Here's a more complete picture of setup with the 320x240 touch display planned for the logger There's still room for much improvement on the amount of space not used. so plan in schrinking it as much as possible.

Just found this on Water quality that might be interresting sensor to add to the ROVhttp://a8859ac08703feae2ef0-3c64237a4c774bc09c139d4dc157b552.r26.cf2.rackcdn.com/WP_Water%20Quality%20Assessment%20Using%20Multispectral%20Imaging.pdf

Sensor board allmost ready for first test

Finally color sensor arrived

Finally quad band gsm and GPS module arrived

Discovered that I was programming Arduino in 0022 and they moved to 1.0.6 now with a few changes esp. on Serial.print Suddently my code doesn't work after migrating to the 1.0.6 as it keeps writing to SD card without closing file so back to work on my software again

Alternative storage if uDrive system crashes

And some more work on a op-amp circuitry so I can control gain tru sw. Maxim DG202AK for the interrested people

As sw now running "perfectly" I just had another (bright?) idea... Datalogger could send live measurements to my website via GSM or GPRS. So found this module that includes a GPS as well.seeedstudio.com/depot/LoNet-Mini-GSMGPRSGPS-Breakout-p-2183.html Rather cheap compared to other types of GSM/GPRS stuff and you get GPS. So problem is now some way to store data on my ASP website and if possible also show it as graphs/bars..

Sorry for long delay in updates from me. Well started new job as technitian at sky-watch.dk so not a lot progress made with this project as didn't have much time. First off struggeling with some strange SW problem averaging on a different sensor than on my last post's This sensor http://bit.ly/1xTNQai My Arduino code is as follows: Trying to find the fault in String Temp_water() I have added 3 Serial.print First one gives correct value out - This one: Serial.println (readings[index]); Next 2 are off in values, but I can't see why... Serial.println (total); and Serial.println (average); Data on serial port: Serial.println (readings[index]);24.18 Serial.println (total);145.07 Serial.println (average);29.01 Bit heat from my hand on sensor and temp goes up: Serial.println (readings[index]);27.31 Serial.println (total);152.85 Serial.println (average);30.57 Value of average matches ok with total as that is 1/5 value #include <math.h> float water_temp; // float Thermistor(int RawADC) { long Resistance; float Temp; // Dual-Purpose variable to save space. float pad = 10010; // balance/pad resistor , set this to // the measured resistance of your pad resistor Resistance=((1024 * pad / RawADC) - pad); Temp = log(Resistance); // Saving the Log(resistance) so not to calculate it 4 times later Temp = 1 / (0.001129148 + (0.000234125 * Temp) + (0.0000000876741 * Temp * Temp * Temp)); Temp = Temp - 273.15; // Convert Kelvin to Celsius water_temp = Temp; return Temp; } String Tempwater() { digitalWrite (Vcctemp_water ,HIGH); // Enable VCC delay(50); // Delay a bit... to stabilize VCC // Define the number of samples to keep track of. The higher the number, // the more the readings will be smoothed, but the slower the output will // respond to the input. Using a constant rather than a normal variable lets // use this value to determine the size of the readings array. const int numReadings = 5; static float readings[numReadings] = { 0.0 }; // the readings from the analog input static int index = 0; // the index of the current reading static float total = 0; // the running total static float average = 0; // the average static bool initialized = false; if (!initialized) { average = Thermistor(analogRead(ThermistorPIN)); // read ADC and convert it to Celsius for (int no = 0; no <= numReadings; no++) { readings[no] = average; total = total + average; } initialized = true; } // subtract the last reading: total= total - readings[index]; // read from the sensor: readings[index] = Thermistor(analogRead(ThermistorPIN)); // read ADC and convert it to Celsius Serial.println (readings[index]); // add the reading to the total: total= total + readings[index]; // advance to the next position in the array: index = index + 1; // if we're at the end of the array... if (index >= numReadings) // ...wrap around to the beginning: index = 0; // calculate the average: Serial.println (total); average = total / numReadings; Serial.println (average); String stringResult = ""; int tempheltal = (int)average; int tempdecimal = (int)((average - (float)tempheltal)*100); stringResult = stringResult + tempheltal + "," + temp_decimal; digitalWrite(Vcctempwater ,LOW); // disable VCC return stringResult; }

Nice to order parts to find out there's 6-8 weeks delivery time due to spec. ADC that no one in Europe stock...

David, here's a Picture for You!

Some parts soldered, just need to order the rest...

Fits like a glove :D Just need to find time to start hand solder it...

Text size of 30 is not good , maybe 32 is smallest they can handle...

Quality looks ok, thinnest lanes are 6mill in width

Today pcb and stuff arrived without customs problems. Shipping time from Elecrow is ok fast to Denmark. Here's Pictures of the PCB's

This Fellow arrived today. Looks good with soldering and so on. http://bit.ly/1mFJLnK So it's time to struggle with sw....

This was a nice mail to get a Picture with items ordered ready to ship! Seems they are working rather fast to make the PCB's - Next thing is how the quality is...

A video from the lake so you have an idea on how it looks. All of these fish are aquarium fishes and some rather rare

Short update on colorsensor(s)... Just bought this on ebay, much cheaper than a diy for test if it can be used insode the ROV.. http://bit.ly/1mFJLnK Also finally ordered pcb after latest changes for my 8color sensor, hope all mistakes have been removed.

After some thoughts about bringing loads of equipment I deciced to try and make a small portable charger. I did some research on different charging IC's and at first Texas BQ2054 looked good untill Guys at OpenROV HQ decided they want to change batteries from LIPO to LiFePo4.. I ended up with the Linear LT3562HVEMSE that is a multi-charger IC. Datasheet can be found here:linear.com/product/LT3652 This Circuit isn't final-tested yet, only made in Eagle so it's "as is"

Loads of testing with solar panels and I have ended up with 12 small panels that can at best produce 5V and 1,2A Still working on the color sensor after finding few faults in my layout...

First try on the color sensor pcb, still needs few changes. Not sure if it should be stackable or "just" with wires.

Logger coming a lot further now.. Need to get a pcb made to get last 8-color sensor in place. After last post with the logger it came to my mind that in Africa you have lot of heat that most Electronics don't like. The extra sensor pcb will also have automated fan control starting at 45 degrees C and shutting off arround 30 degrees C. As you can see with the box size I plan to use a small 5V fan to try and keep the heat Down. Biggest problem is still the sw..

Please note Malawi still have lot of wildlife and now also the first 3 lions since 1980'ies. Do be carefull when moving arround as You may run into different not so nice animals. Notice distance from Beach to hippo in front , that is right in front of house where base is.

All my trips are based at a collectingstation in Chipoka where we sail out from to the different Places. Plan is to use Fisfinder/Plotter to find reefs and then deploy OpenROV to explore , this saves a lot of time compared to going in with scuba. Following equipment must be small, handy and have low power consumption: Fishfinder/plotter combo OpenROV (Of cause!) My own stand-alone DIY logger (In development): Water values: Ph, ORP,Conductivity, temperature. Above water: wind speed and direction, Rain, Light in Lux and RGB colours, Pressure (mbar), temperature and humidity. A camera is taking pictures of the lake for comparison to data on it's own SD. All measurements are marked by time taken from a RTC Solar-charger as backup for uC (6A LiPO) Data stored on uSD Some kind of solar charger as most collecting trips easily are 5 days at remote Places without electricity and just sleeping in a tent on the Beach. Logger is now in Our livingroom window to see if solar panels can generate eanough power to drive and charge the battery with the amount of sun here in Denmark. One solar panel can generate 100mA and system have 7. for Denmark that is not good eanough. Need to sort out way to switch off power supply to different circuitry to save power when they aren't in use. Video on how they catch fish in Malawi, underwater from arround 10:10 min:youtube.com/watch?feature=player_embedded&v=ry536J1uhyA

What I allways bring and have sorted out before I travel as weight is a problem: Places to visit for diving and exploring Own dictionary with local names. Books - esp. Lonely Planet. Air ticket - remember extra bag for gear may be necessary due to weight! Visa - if needed Insurance - also for equipment Passport Money - USD Vaccinations - yellow fever, hepatitis, diphtheria, tetanus BUT ALLWAYS CONSULT A DOCTOR BEFORE TRAVELLING Medication - diarrea, seasickness, eardrops against Inflammation of the middle ear due to lots of diving. Sunblock - the higher number the better as You are straight beneath the sun and out on a lake. Mosquito repellant Soap, deoderant, shavingtools, towel, Hypodermic needles, patches and similar. Travel adapter as Malawi use UK plugs. Extra batteries for camera, videocamera, cameraflash, flashlight, GPS. Cardreader to empty cameracards Bag for camera's Sleepingbag sleeping pad Tent T-shirts Shorts Zipp-off pants - good for traveling as you come from colder weather to warm Raincoat Sunglasses cap foreign legion style as it gives shade to neck to avoid sunburn Running Shoes - most comfordable as sandals aren't nice with sand in Zip-it bags, stickers, ball-pen for notes Padlocks - for cases, sadly if they can steal it they will! Strips duct tape - of cause! GPS, fishfinder Camera Additional lenses Videocamera Underwater housings fine-meshed nets ABC scubagear - mask, fins, snorkel Spareparts for scubagear: mouthpieces, mask strap, O-rings and grease Tools for fixing scuba Shorty divesuit, kneepads as you move arround on rocks to catch fish, Divelight, speargun, ponybottle Adresses for postcards, phonenumbers to relatives if any problems occur.

Expeditions Following