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--- projects:picoatlas:picoatlasviii [2012/11/20 18:55] – [Experiments] jcoxon
+++ projects:picoatlas:picoatlasviii [2012/12/18 07:13] (current) – jcoxon
@@ Line 1: / Line 1: @@
 ====== PicoAtlas VIII ======
-===== Experiments =====
+===== Components =====
-UKHAS badge board with RFM22, Arduino328 with 8Mhz external crystal (no brownout) running off a 1.8v MCP1700 regulator, 2.5V 10F supercap in parallel to badge board. Charged initially by 3.7v lipo to 1.8v and then this supply is removed either to run off the supercap or the solar panel.
+  * pAVA R7 board with linear regulator
+    * Atmega328
+    * Rfm22b
+    * Ublox 6
+  * 2 x AAA
+  * 2 x 3.7v 100mA solar cells in parallel
-  * 50baud, 1 string every minute, under a lamp indoors
+===== Launch 1 =====
-    * Just Cap = 5mins 36secs
-    * Solar Cell = 18mins 49secs
-  * 300baud, 1 string every minute, under a lamp indoors
-    * Just Cap = 12mins 21secs
-    * Solar Cell = Continuous
-==== Improvements ====
+  * Launch 1 was on 15/12/12 - unfortunately on releasing the payload it did not have enough lift resulting in it dragging across the fields and getting caught in a tree 2km away, max altitude was 101m. Was recovered the next day (still transmitting).
-  * 2.5v regulator then supercap and then 1.8v reg to the board - this would exploite more of the supercap as we'd get the drop from 2.5v down to 1.6 rather than 1.8 to 1.6v.
+==== Lessons ====
-  * Boost regulator between supercap and board so we could use all the supercap.
+  * Need to launch Pico's in ideal weather, from now onwards I plan to only launch in:
-  * Tighter powersaving
+    * Ground windspeed < 8km/h
+    * < 50% cloud cover
+    * no rain or forecast rain
+  * Need to take in to account that lifting gas might cool once outside and lose lift, may require a little more gas before launch.