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Power management using Ebyte E32 LoRa modules

JabbaJoe last edited by

Hi all!

I would like to discuss some topics about Tx power regarding the E32 modules from Ebyte.

The first question is about the maximum transmission power (dBm). Ebyte claims that some models (e.g.: E32-915T30S, E32-868T30S) have Tx power of 30 dBm (1W). The problem is that Semtech's SX1276, using PA_BOOST, has a maximum of 20 dBm at Tx power (and is limited to 1% duty cycle). How Ebyte can deliver 10 dBm more than the max available from SX1276 ? I understand that 20 dBm would be the max possible power, and with restrictions on operation.

In E32-915T20D user manual, they present this table for parameter setting

It shows that 20 dBm is the default option, implying that this power can be used with no limitations in regular operation.

This leads me to the second question.. Is it right? Can I used 20 dBm of Tx power freely?

In this same table, it shows a minimum power of 10 dBm. On the other hand, SX1276 manual shows a minimum of 2 dBm using PA_BOOST. Why Ebyte limits it to min of 10 dBm?

If we read E32-868T20D manual (apparently a module with 20 dBm max Tx power), it shows the following table

I am pretty sure it's a typo... For this module (as it is a 20 dBm max), the table should be like the one shown in E32-915T20D manual.

Nonetheless, for modules sold as 1W power (e.g.: E32-915T30S, E32-868T30S), this table should be right. This leads to the first question.. How is it possible to deliver 30 dBm Tx power?
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I have success! (oops, that's suppose to be Timer1) I only sample for 1/60 of a second. What I did was to back up all the timer registered I used and then resorted them after I was done sampling. (As opposed to initializing the registers in setup and then starting the timer when needed.) Now I have a Nano sampling the data and sending it to a MySensors Gateway on an RPi3B+ which then sends it to an MQTT broker runing on an old laptop. Also running on the laptop is Home Assistant running inside of VirtualBox. If MySensors does use Timer1, it appears that restoring the registers allows it to be shared. //------------------------------------------------------ISR ISR(TIMER1_OVF_vect){ // interrupt service routine for overflow TCNT1 = TimerPreloadValue; // must be first line! starts the timer counting again digitalWrite(TRIGGER_START_SAMPLE_PIN,HIGH); samplesVolts[--sample]=analogRead(VOLTS_IN_PIN); // decrement before capturing samplesCurrent[sample]=analogRead(CURRENT_IN_PIN); digitalWrite(TRIGGER_START_SAMPLE_PIN,LOW); if (!sample){ // count down to zero digitalWrite(TRIGGER_START_SAMPLE_PERIOD_PIN,LOW); // indicate that sampling is complete samplingEnd = micros(); TCCR1B &= 248; // turns off timer } } //------------------------------------------------------sampleOneCycle void sampleOneCycle(){ // back up timer registers uint8_t TCNT1_b = TCNT1; uint8_t TCCR1B_b = TCCR1B; uint8_t TCCR1A_b = TCCR1A; uint8_t TIMSK1_b = TIMSK1; // configure timer which starts the sampling noInterrupts(); // disable all interrupts TCCR1A = 0; TCCR1B = 0; TCNT1 = TimerPreloadValue; // preload timer //TCCR1B |= (1 << CS10)|(1 << CS12); // 1024 prescaler TCCR1B &= 248; // turns off timer? TIMSK1 |= (1 << TOIE1); // enable timer overflow interrupt ISR // demark sampling sample = NUMBER_OF_SAMPLES; // count down to zero digitalWrite(TRIGGER_START_SAMPLE_PERIOD_PIN,HIGH); samplingStart = micros(); TCNT1 = 65535; // first trigger right away! TCCR1B |= 1; // turns on timer interrupts(); // enable all interrupts // wait for sampling to be complete while(digitalRead(TRIGGER_START_SAMPLE_PERIOD_PIN)){}; samplingEnd = micros(); // restore timer registers TCNT1 = TCNT1_b; TCCR1B = TCCR1B_b; TCCR1A = TCCR1A_b; TIMSK1 = TIMSK1_b; }

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