Search found 21 matches

by TomWS1
Thu Nov 07, 2019 8:14 pm
Forum: ESP32 Arduino
Topic: [SOLVED] SECOND SPI QUESTION
Replies: 3
Views: 985

Re: SECOND SPI QUESTION

Now i want to implement the HSPI on core1 for an ADXL345 accelerometer. I have this sketch that i'am trying to implement but this is not working for some reason. I always get 0,0,-1 results on the serial. If I recall correctly, the ADXL345 isn't a pure SPI interface as it can switch between SPI and...
by TomWS1
Thu Oct 10, 2019 11:56 am
Forum: ESP32 Arduino
Topic: OTA with ESP32 as AP
Replies: 6
Views: 3666

Re: OTA with ESP32 as AP

@machiel, nice contribution! I've wondered how to include jquery into an embedded webserver. Thanks for showing us a way.
by TomWS1
Sun Sep 29, 2019 12:03 pm
Forum: Hardware
Topic: IO34 & IO35 with Reed Switch & ESP32
Replies: 4
Views: 1254

Re: IO34 & IO35 with Reed Switch & ESP32

Also, why use 2 IO pins when you can use one to do the same thing. Tie REED_NC to +3.3v, and tie REED_NO to GND. From the Com. side of the reed (the side you have going to 10k then to +3.3v) take that to your input pin. Good suggestion, but considering that the reed switch will always be positioned...
by TomWS1
Wed Sep 25, 2019 12:57 pm
Forum: ESP32 Arduino
Topic: Issue running LoRa with dual cores
Replies: 5
Views: 1242

Re: Issue running LoRa with dual cores

It is imperative to use the default GPIO's for the LoRa RFM95W module viz: GPIO5 -- SX1278's SCK GPIO19 -- SX1278's MISO GPIO27 -- SX1278's MOSI GPIO18 -- SX1278's CS GPIO14 -- SX1278's RESET GPIO26 -- SX1278's IRQ (Interrupt Request) HSPI cannot be used with TFT_eSPI library as LoRa uses GPIO 14 f...
by TomWS1
Tue Sep 24, 2019 1:05 pm
Forum: ESP32 Arduino
Topic: Issue running LoRa with dual cores
Replies: 5
Views: 1242

Re: Issue running LoRa with dual cores

It seems to me that sharing hardware pins between the two cores is inviting disaster. Either you need to use semaphore locks or use totally separate pins. The access to the display is probably synchronous and manageable (if data transfers are kept small). Since the LoRa code is probably interrupt dr...
by TomWS1
Tue Sep 17, 2019 8:04 pm
Forum: Hardware
Topic: Recommend some H Bridge chip with low voltage drop please
Replies: 3
Views: 1052

Re: Recommend some H Bridge chip with low voltage drop please

@Zeni241, what latching solenoid are you using that operates on 3V? What is the solenoid activating?

I have circuits for operating latching solenoids but these usually require much more than 3V to switch (typically 9V or greater).
by TomWS1
Sat Jul 27, 2019 2:28 pm
Forum: Hardware
Topic: I2C transmission errors. Rounded I2C clock edge from ESP module?
Replies: 6
Views: 1479

Re: I2C transmission errors. Rounded I2C clock edge from ESP module?

I agree with @bobtidey, definitely use a 10X probe while probing clock signals, but also, for I2C, I would not recommend any pullup resistor above 5K.
by TomWS1
Sat Jun 29, 2019 3:34 pm
Forum: Hardware
Topic: Using development board in production stage
Replies: 8
Views: 2233

Re: Using development board in production stage

Another reason to use pre-existing modules in a product is that it is easier to get FCC, etc. approvals if you're using a module that is already approved.
by TomWS1
Sat Jun 29, 2019 3:20 pm
Forum: ESP32 Arduino
Topic: ESP32 vs Ardiuno - analogRead problem
Replies: 2
Views: 1372

Re: ESP32 vs Ardiuno - analogRead problem

Besides buffering, a simple technique to lower the impedance of the Analog source (if its slowly varying, like a Pot), is to add a capacitor between the analog input and ground. Typically a 100nF cap is more than enough to help stabilize the readings.
by TomWS1
Thu Jun 13, 2019 12:13 pm
Forum: Hardware
Topic: Recommend a voltage regulator/buck converter for ESP32 project
Replies: 3
Views: 2843

Re: Recommend a voltage regulator/buck converter for ESP32 project

Also, what is the reason for using a buck converter in the reference design? Why wouldn't a regular LDO work? I used the MIC5219-3.3 extensively in many of my designs for battery powered projects in the past. Am I doing something wrong all this while with just using a standard LDO? I'm not familiar...

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