I’m still having issues properly loading
the Moteino using the
KAW on startup. I’ve been fooling with the code yesterday to once again
confirm
that the code will execute fine if enough power is in the capacitor but
never
load if capacitor never reaches a voltage higher than the required v_min
of the
moteino 3.3V voltage regulator. Since I now have an oscilloscope, I
decided to give it a go and investigate how much voltage I am feeding it
when I plug in the KAW.
Yellow Channel = 13V9 red wire to KAW
Yellow Channel = 13V9 red wire to KAW
Blue Channel = vin output power circuit
The first test is to connect the KAW and no moteino load after the charging capacitor. The screenshot below shows the output rising to about 5.3V at 1.1
sec and settling to 6V in 1.7 sec. The 13V9 line also looks to be taking its time to settle at its voltage. Also note that I've added an extra 100nF (250V) to the 470nF capacitor of the KAW High Voltage circuit.
With the Moteino connected you can see the waveforms now
smaller in magnitude, never reaching the voltage seen before. The output after a few minutes will settle at
about 2.4V, never reaching the v_min to power up the moteino.
The output is also extremely noisy! I think I'll start by studying the power circuit drawn from the KAW. The RC values might need some adjustments to decrease the time to charge the capacitor, I'll try reducing the resistor to see if it yields a positive outcome.
I've been using even more minimal do-nothing code temporarily to understand the and fix initialization stage. Also note that I'm using an RFM69 instead of the 12B.
ReplyDeleteHere's my minimal code:
void setup () {
LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_ON);
radio.initialize(FREQUENCY,NODEID,NETWORKID);
radio.setHighPower(false);
radio.sleep();
pinMode(HzSENS,INPUT); // D3 is IRQ1
pinMode(LED,OUTPUT);
digitalWrite(LED,LOW); // off
bitClear(ADCSRA,ADPS0); // speed up ADC to minimize phase measurement error
bitClear(ADCSRA,ADPS1); //
bitSet(ADCSRA,ADPS2); //
}
void loop () {
LowPower.powerDown(SLEEP_4S, ADC_OFF, BOD_ON);
}
I'll try adding another 100 uF to the HV of the KAW first and see how the scope shows the climb. I did connect it differently on the board than you did on your video, I'll post some pictures later on.
Check out the post "KAW RF - Adding 2x 100nF caps to HV circuit" It's a continuation to this.
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