Supplies for basic payload design  

James Zelazny jr
(@n2nxz)
Member Registered

Here is a list of supplies I personally use to build the U3s based payloads.

This is just a random list of links to better understand components being used.You can use alternative supplies in your design that best suits your needs or if you find a better solution.

First off,the U3s kit in which to program and test your system and setup your Atmega328p using bands and modes you wish for your flight -

http://qrp-labs.com/ultimate3/u3s.html

This kit already comes with the Si5351 module but you can get more here -

http://qrp-labs.com/synth.html

If you are using the Atmega chips directly in your payloads,find good prices on blank Atmega`s here -

http://www.ebay.com/itm/5-PCS-MCU-IC-DIP-28-ATMEGA328P-PU-Microcontrolle-r-ATMEGA328P-US-SHIPPING-M178-/401277012808?hash=item5d6df94b48:g:xPEAAOSwsB9WDgnY

Here are Ublox NEO-7M GPS modules used in this design and seem to work very well -

http://www.ebay.com/itm/GPS-Ublox-NEO-7M-000-with-Mini-Antenna-Module-MWC-APM2-6-Replace-NEO-6M-GYGPSV3-/112411661559?var=&hash=item1a2c41d4f7:m:m4_dihH5vZF-J0wt7glKHnQ

Do not use the NEO-6M modules.They are too power hungry for using in flight.

The QRP Labs U3s kit can also be used to program your blank Atmega 328P chips.I personally use this programmer,but others are available.Programming can be tricky and depends which programmer you are using.This will most likely be discussed later.

https://www.sparkfun.com/products/9825

Here is the battery and solar cells I use.Again,other methods are up to the individual -

http://www.ebay.com/itm/Cheerson-CX-10-002-VA18-3-7V-100mAh-Lipo-Battery-for-RC-Quadcopter-Latest-B0X3-/132182624107?hash=item1ec6b2c76b:g:NZ4AAOSw~y9ZDU7k

The batteries have a built-in overcharge/over discharge protection circuit.

Solar cells can vary but again,these are what I use -

https://www.aliexpress.com/item/100pcs-52x19mm-solar-cell-for-DIY-solar-panel-DIY-cell-phone-charging-Free-shipping/32283633274.html?spm=2114.13010608.0.0.qrQICu

Blocking diode is needed from solar to battery -

http://www.ebay.com/itm/20pk-1N5817-Schottky-Diode-/371551572804?hash=item5682331344

This is for operation @ 5 volts using the 3.7v lipo into a boost module -

http://www.ebay.com/itm/10PCS-DC-DC-Boost-Converter-Step-Up-Module-1-5V-to-5V-500mA-Power-Module-New-/172265362979?hash=item281bd0d623

20 mhz crystal needed for Atmega 328P -

http://www.ebay.com/itm/10PCS-20M-20MHz-20-000M-20-000MHz-Crystal-Oscillator-Cylinder-3mm-8mm-/251550273168?hash=item3a91908e90

Get a supply of small 22pf capacitors along with some .1uf ceramic which will be uses in this circuit.

A 4.7uh choke is also used in the circuit.

This design is based on my skill level and you can change or improve any part you see fit.

Magnet wire of your choice can be used to wire the circuit together.Choose any type you like but keep in mind,less weight is better !!

These links are just for reference.You can hunt down supplies anywhere you see fit and shop for better bargains.These were for a visual look at what you are working with.

Jim,N2NXZ

 

 

Edited: 7 months  ago
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Posted : 13/06/2017 4:22 pm Roberto Pietrafesa liked
James Zelazny jr
(@n2nxz)
Member Registered

Here is a basic schematic of the above circuit.Again,this is my method and best to make improvements where you see fit based on your knowledge of circuits.Eventually,will add the 3.3 volt modifications as it will reduce weight when used as a balloon payload.This diagram is purely based from QRP Labs U3S schematics.Temperature sensor and battery voltage circuits can also be added along with an LED if desired.

See page 2 - https://www.qrp-labs.com/images/ultimate3s/assembly_u3s_r3_a4.pdf

Jim

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Posted : 13/06/2017 5:59 pm
James Zelazny jr
(@n2nxz)
Member Registered

Here is a look what the 5 volt system can look like.Lots of room for improvements for dropping weight using your own imaginations and materials.

2 x 36" Qualtex foil balloons will easily fly the payload to 30,ooo ft or better depending on how light weight you make it.This one is 30 grams or less.

Balloon example - http://www.bargainballoons.com/10Browse.asp?Search=12683&gclid=Cj0KEQjwmv7JBRDXkMWW4_Tf8ZoBEiQA11B2fkUk4c2AmtGaz4U61uD0p6H_Pu57NbItqpNw0mWSR4AaApoQ8P8HAQ

Or go big - http://www.scientificballoonsolutions.com/products/

 

 

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Posted : 13/06/2017 6:11 pm
James Zelazny jr
(@n2nxz)
Member Registered

Another note about programming.

If you are not interested in programming blank Atmega 328P-PU chips,another alternative is buying new chips with firmware already loaded to insert into your U3S kit and simply setup your bands/modes then pull the chip for your payload design.

They are found here ready to plug in and use -

http://shop.qrp-labs.com/index.php?route=product/category&path=65

I have been using V3.10a and not sure how the other versions work.

 

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Posted : 13/06/2017 8:54 pm
James Zelazny jr
(@n2nxz)
Member Registered

Just to cover another method for your payload design,going to add the 3.3 volt modification of the Si5351 module.

Using 3.3v will reduce weight for your payload by eliminating the 5 volt boost module (2.3 grams) and rather than 8 solar cells only 7 (.4 grams each cell).

I am sure other means to reduce weight can be used,but this is only things tried for me.

Components in GREY are removed from the Si5351 module.Red indicates a jumper.Note that when using 3.3v in your system,you need to change one fuse setting when programming your Atmega 328P-PU chip.

Programming is a topic for later discussion when the time comes.

Jim

 

 

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Posted : 15/06/2017 3:35 pm Roberto Pietrafesa liked
  
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