Recent Posts

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1
Support / Re: Simblee MSL
« Last post by Wayne on May 27, 2017, 04:43:35 AM »
I have 3 proto boards being made and populated by a local house here. 
Will find out in a bit..
2
Support / Simblee MSL
« Last post by Tim on May 26, 2017, 06:50:09 PM »
Hi all,

Have been learning all about MSL (Moisture Sensitivity Level). Recently, distributors have been affixing MSL caution labels to the ESD bags Simblees are shipped in, stating level 3. I wrote support@rfdigital.com and received word that Simblee is actually rated MSL 6. This means chips need to be baked (8-12 hours at 125°C) before mounting/reflowing, and following baking, the chips need to be mounted/reflowed within 6 hours.

We've never baked before mounting/reflowing. We've been hand assembling (using stencil to apply solder paste, hand placing components, including Simblee, then reflowing in reflow oven) and have been getting a failure rate of around 1 in 10. I'm waiting for reply from RF Digital with their opinion about the possibility that not baking Simblee before mounting/reflowing is contributing to the failure rate. Although we are not happy to learn about the baking requirement (which increases assembly time and cost), we'll be happy if baking prior to mounting/reflowing reduces our failure rate.

Any experience out there?

Many thanks,

Tim
3
Support / Power cunsumption on 2 AA 2500mAh batteries.
« Last post by Wayne on May 26, 2017, 01:45:48 PM »
Today is not my best day in math..  And I have tried to reason this out to find how long the 2 Alkaline Batteries will last as directly connected to a Simblee in ULP.

Scenario is:
SimbleCOM:
Pressing the button to wake up the Simblee from ULP, full rf power drawing 14mA.
Time is on a 8 hour day, the button will be pressed intermittently for a total of 18.4 mins. or 2.3 mins every hour. The no button pressed for 16 hours.
The batteries have a capacity of 2500mAh.
No Bucky in use, just straight to the Simblee for power. No LEDs'  Button and supported parts.

4
Support / Re: hand soldering Simblee module?
« Last post by Tim on May 25, 2017, 08:16:00 AM »
Hi Anthony,

You might find this thread helpful:

http://forum.rfduino.com/index.php?topic=1735.0

Cheers,

Tim
5
Support / Re: Simblee assembly and pick'n place machines
« Last post by Tim on May 25, 2017, 08:08:03 AM »
Some new information to share ...

Have been learning all about MSL (Moisture Sensitivity Level). Recently, distributors have been affixing MSL caution labels to the ESD bags Simblees are shipped in, stating level 3. I wrote support@rfdigital.com and received word that Simblee is actually rated MSL 6. This means chips need to be baked (8-12 hours at 125°C) before mounting/reflowing, and following baking, the chips need to be mounted/reflowed within 6 hours.

We've never baked before mounting/reflowing. I'm waiting for reply from RF Digital with their opinion about this possibly contributing to the failure rate we are experiencing. Although we are not happy to learn about the baking requirement (which increases assembly time and cost), we'll be happy if baking prior to mounting/reflowing reduces our failure rate.

Any experience out there?

Many thanks,

Tim
6
Support / Re: hand soldering Simblee module?
« Last post by tolson on May 23, 2017, 11:43:02 AM »
I know this is an old topic however I just wanted to share my own experience with other users.

Actually, I for one appreciate when new info is added to old topics as long as it is related to the topic at hand.
7
Support / Re: hand soldering Simblee module?
« Last post by Anthony.phan on May 23, 2017, 08:25:29 AM »
I know this is an old topic however I just wanted to share my own experience with other users. I intended to use the simblee in my own wearable due to its tiny form factor. The cost of getting this soldered onto my own custom PCB was very high as my PCB manufacturor has a minimum quantity of 5 units for PCB assembly. I figured I would try soldering it myself with a heat gun and IR soldering station as I am quite experienced in these techniques. Using both methods I managed to destroy a total of 5 simblees.. So i would not suggest hand solder these modules.

Its is a real shame that these  are soo difficult to solder as I believe it is deterring many hobbyist from using this in their own custom PCB's.
8
Support / Clock stretching I2C with RFduino
« Last post by andrey_dung on May 19, 2017, 12:36:04 AM »
How do I implement clock stretching with I2C in RFduino? It seems that the RFduino Wire library does not support that?
9
Support / Re: Simblee - OTA programming?
« Last post by Ivanot88 on May 18, 2017, 12:15:13 PM »
Hi thank you for your work, could you please explain the usage of the new package you modified?
What we have to do to get the zip after substituted the folder?

Thank you very much
10
Suggestions / Re: What Sensors would you like to see in the Simblee Ecosystem?
« Last post by tolson on May 17, 2017, 12:32:09 PM »
Patty,

They want the SFM APPS to work first. Asking what more sensors is futile as the ones people responded to the same question for the RFduino several years ago still haven't seen the light of day for the most part.
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