@alowhum

It's not portable but for the AVR architecture you can use:

void before() {
  wdt_disable();
  wdt_enable(WDTO_8S); // 8s timeout 
}

void loop() {
  wdt_reset();
}

Other watchdog options for the AVR architecture here.

@dzungpham0703

I replied in the nrf51822 thread. Yes I managed to make it work like the original with BLE stack. And using the wonderful Cypress Proc BLE solution including capsense and lots of goodies . Cypress really rocks! I love them.

The current consumption was lowered to 200uA without being connected and 700uA connected. Those numbers include LEDs current consumption and other blocks like touch sensing.

I'll get back with more updates when it's finished.

@dzungpham0703

Yep. I managed to make it work as the original one by using only the BLE stack and no external capacitor. The current consumption was lowered to 200uA without being connected and 700uA connected. Those numbers include LEDs current consumption and other blocks like touch sensing.

I'll get back with more updates when it's finished.

@shabba

The majority of the components are 0603 SMD package type (except 2 smd resistors on the usb lines which are not really mandatory and can be replaced with a solder bridge).

There you go (extracted from schematic - I can't do better than this because it involves more work and I don't have time for it, sorry):

a) 9 x 100nF 0603 SMD MLCC capacitors, X5R/X7R (voltage can be 10V and above)
b) 3 x 1uF 0603 SMD MLCC capacitors, X5R/X7R (voltage can be 10V and above)
c) 1 x 10uF 0603 SMD MLCC capacitor, X5R/X7R (voltage can be 10V and above)
d) 1 x 22uF 0603 SMD MLCC capacitor, X5R/X7R (voltage can be 10V and above)
e) 1 x 10nF 0603 SMD MLCC capacitor, X5R/X7R (voltage can be 10V and above)
f) 1 x ferrite bead 0603 SMD blm18he152sn1d
g) 3 x 330 ohm 0603 SMD resistor
h) 1 x 1Kohm 0603 SMD resistor
i) 1 x 10Kohm 0603 SMD resistor
j) 1 x 56Kohm 0603 SMD resistor
k) 1 x MCP1703A-3302 3.3V/0.25A voltage regulator
l) 1 x TXB0104 voltage level converter
m) 1 x ATMEGA328P-MU AVR MCU (QFN32 package)
n) 1 x CP2102 USB to serial (QFN28 package)
o) 3 x 0603 SMD LEDs (your pick here)
p) 1 x ATSHA204A (SOT-23 package)
q) 1 x RFM69W module (your pick regarding working frequency)
r) 1 x ZTTCS16.00MX ceramic resonator
s) 1 x USB A type male connector for PCB and 1 SMD reset switch (I have no exact links for this, sorry)

For 8051 cores there's the SDCC project but I don't know how stable/mature is and/or what are its limitations. And it's a C compiler only as far as I know.

AllPCB it's great with DHL shipping. At least for now. It's true that the boards final price includes shipping too but it's still cheaper via DHL. Even if I have to pay VAT it's ok (19%). For the very short time to my door which is 3-4 days that's just WOW compared with 3-4 weeks via regular shipping.

@gohan I tried smart-prototyping in the past and they are pretty ok I can say but not the best compared to PCBWay for example. For cheap services and pretty decent quality I will still opt for Elecrow for example. And for pretty decent quality and very fast shipping - AllPCB - at least for now and if their prices won't go higher in the future.

Oh and AllPCB finishes the boards in 2 days for that price. Compared to EU factories it's still the cheapest - you can't beat China when it comes to that. Here in EU for the same price that AllPCB does I get ONLY 3 boards...wtf..so yeah you get the idea.

@toyman

You can find it in my kicad repo: symbol and footprint

I didn't used it in any design so please double check.

@alexsh1

I'm sorry but I think I'll abandon this one because I don't have any time left to deal with it.

@andrew
Where did you buy that green thing that sits on your work desk (it has some kind of ruler on it and squares). I don't know how it's called but I keep seeing it and I think I want one too. Thanks.