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--- ft818:aio_box:v2 [2020/05/07 23:08]
f4ija
+++ ft818:aio_box:v2 [2020/06/11 16:40]
f4ija
@@ Line 1: / Line 1: @@
 ====== V2 AIO Box ======
+{{ :ft818:aio_box:img_20200601_130552.jpg?600 |}}
 ===== Changelog =====
   * Box has now some rear legs to permit to do not install it vertically on the fans.
@@ Line 11: / Line 13: @@
   * Better hole for disconnecting the microphone plug, to be able to put the thumb to release.
+===== Specifications =====
+  * Overall dimensions : 272x156x74mm
+  * Weight : 2150g with everything (FT-818 + its battery pack, AIO battery pack, RPI4, wires, connectors, etc)
+  * Material for printed parts : PLA or PETG
+  * Battery pack capacity : Lithium ion 3S2P 6600maH + internal FT-818 battery pack
+  * Cooling : passive and active with thermal switch
 ===== Wiring diagram =====
 {{ :ft818:aio_box:wiring_diagram_v2.png?600 |}}
@@ Line 43: / Line 51: @@
 | RJ45 socket | 1 | [[https://www.conrad.fr/p/prolongateur-rj45-femelle-8p8c-vers-rj45-femelle-8p8c-cliff-cp30220-1-pcs-1383229|link]] | To directly connect to the RPI through RJ45 |
 | 4mm banana socket | 1 | [[https://www.conrad.fr/p/borne-de-polarite-stylo-4-mm-tru-components-tc-r1-14m-b-1587894-noir-10-a-1-pcs-1587894|link]] | for counterpoise connection |
+===== Passive cooling system =====
+Regarding the V1, the V2 integrate a new passive cooling system to cool down the RPI4.
+The RPI4, with its power, is also a small heater and for field op, I don't want to fry it with to high temperature on the main processor.
+So on the V1, I've added some fans at the back of the box, with a 40°C thermal switch to trigger once the temperature was above that to cool it down.
+But with that system, event it's working, was that the fans were trigerred almost all the time, 5 minutes after the RPI booted up.
+The fans noise and the extra current consumption is not a really good idea.
+On the V2, the whole bottom of the box has been replaced by an aluminium plate to create a heatsink with a small CNC milled aluminium block, in contact with thermal paste to the processor :
+{{ :ft818:aio_box:coimg_20200525_214736.jpg?600 |}}
+The thermal contact is now screwed on the aluminium block and it's now a 60°C version :
+{{ :ft818:aio_box:coimg_20200525_214953.jpg?600 |}}
+With that setup, the RPI4 is installed upside down but it's not a bad thing, because I've now a better access to the µSD card, to back it up.
+Fans are still installed outside the box :
+{{ :ft818:aio_box:coimg_20200526_001825.jpg?600 |}}
+But with that passive cooling, I was not able to trigger them for now. I leave them in case of extreme situation, for example in field operation in a very hot area (desert for example).
+The bottom plate is now a bit hot after an hour of continuous use of the RPI4, maybe 38°C (didn't measured accurately for now). But there is still a lot or margin before trigerring the fans.
+The result is now a very well integrated RPI4, with an efficient cooling.
+===== Pictures =====
+{{ :ft818:aio_box:img_20200601_125840.jpg?600 |}}
+{{ :ft818:aio_box:img_20200601_125909.jpg?600 |}}
+{{ :ft818:aio_box:img_20200601_130150.jpg?600 |}}
+{{ :ft818:aio_box:img_20200601_130608.jpg?600 |}}
+{{ :ft818:aio_box:img_20200601_130621.jpg?600 |}}
+{{ :ft818:aio_box:img_20200601_130627.jpg?600 |}}
+{{ :ft818:aio_box:img_20200601_130633.jpg?600 |}}
+{{ :ft818:aio_box:img_20200601_130708.jpg?600 |}}
+{{ :ft818:aio_box:img_20200601_130738.jpg?600 |}}

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