Htcc-ab01 vs htcc-ab02

#6

Greeting from heltec.

They are no different in terms of battery. you can refer this:https://resource.heltec.cn/download/

ab02:

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#7

ab01:

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#8

@jasonXu thanks for that info. I will talk with Michelle to make the order.

#9

@jasonXu So i want to double check with you. So in my project I have to use I2C numebr 2 becouse I2C number 1 is busy tiwh oled?

The pin number of I2C numer 2 is 36 and 37 ?

#10

yes, The pin number of I2C numer 2 is 36 and 37.

#11

Actually IIC No. 1 can be used. Use IIC device slave address to select device. OLED’s device slave address is 0x3c.

#12

Got it.
In ab01 I use 2k2 resistor in sda and scl. Your recomned to use in ab02 ?

Screenshot_2020-10-01_08-13-35

#13

yes, our recomned to use in ab02

1 Like
#14

Hello Friend, out of topic question:
It is possible connect the LiPo battery over a pin instead SH1.25-2.

The connector at the bottom of the board difficult connect or disconnect battery after the board are solder to PCB.

#15

hi,

You can lead out this SH1.25-2 interface and change it to the form of pin header.

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#16

Hello friend, can you explain more please I don’t understand

#17

hi,

It is possible connect the LiPo battery over a pin instead SH1.25-2.

You think this is not easy to use. You can change this to the form of pin headers (on the pcb)

#18

Do you mean that I should unsolder the connector on the board and change it for a header pin?

Not available on existing pins?

#19

hi,

sorry, I didn’t make it clear. I mean that when you design a new PCB, you need change the package of the battery compartment to that of the pins package.

#20

Sorry about this, but i dont understant what you want to exaplain me.

The is other way to connect the battery or battery only can be connected over this port?:
Screenshot_2020-10-20_07-52-08

#21

hi,

sorry, I thought you wanted AM01.

If it is AB01, there should be no other way.

#22

Ok friend, got that. Thanks.

#23

@jasonXu Hello friend. I need to read analog voltage to get resistor value with know resistor voltage divisor. Also I need to measurement the current output voltage from GPIO pin.
The problem is the hardware only accept 2.4 v on ADC. I make a voltage divisor to get down the voltage but affect my other voltage divisor.

There is a workaround to read 3.3 volts with ADC or any idea how solve my problem ?

This is my circuit but I cant work like this because the ADC cant read 3.3 volts (the GPIO voltage)

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#24

Hi @dserrano

The voltage divider circuit should be a network of pull-up resistors and pull-down resistors. For example, just like this:
image

In the example, the voltage on GPIO13 should be calculation like this:
image

1 Like
#25

Hi, did you made a SDS011 sensor integration?