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“sudo apt-get install –no-install-recommends git ca-certificates build-essential pkg-config \ libreadline-dev gcc-arm-none-eabi libnewlib-dev qtbase5-dev libbz2-dev libbluetooth-dev libpython3-dev libssl-dev”
Need to get rid of the space in front of…. libreadline-dev. needs to be \libreadline-dev
CORRECTION!!!!
I was using the items in the RC522 packet. When I tried the items in the PROXMARK box… it worked.
Was this supposed to be this way?
#define RST_PIN 5 // Configurable, see typical pin layout above
#define SS_PIN 53 // Configurable, see typical pin layout aboveMFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance
/* Set your new UID here! */
#define NEW_UID {0x1A, 0x2B, 0x3C, 0x4D} The picture above DOES NOT reflect this ID.@Holly… Good morning! Doing some reading in the Raspberry Pi book. Page 11… 1st para… “4 pins…” it says that the 3v3 can supply only up to 50mA.
Lab three… “Intro to GPIO Pins”, second section down, “Raspberry Pi GPIO Pins”… the external link https://pinout.xyz/pinout/3v3_power#, on that page for 3v3… it states that all pi’s since the B+ can go up to 500mA due to switching regulator.
Kind’a a big power difference. The book has a copyright of 2016. Is it safe to say that there has been some component upgrades over all… just like color coding to GPIO pins… that are transparent to most people? If so… how can I tell if I have an older model of an RPi… model 3 and older (As the book topped out on a model 3)?
Am I getting too much into the weeds on this?
Your thoughts?
Leo
Lab three, “Write a Computer Program with a Circuit and GPIO Pins”, “Gather Materials”… states that ANY LED color will do., along with the 100 Ohm resistor. LED forward power range between 1.8V for RED to 4.0V for white.
“Task: Build a Circuit” , you state that forward voltage for GREEN is 2.2V. I thought 2.2 is for YELLOW? (The picture in this section shows a GREEN LED, not YELLOW.
In a prior portion of the lab…. under “Build a Circuit”, “Ohm’s Law”… are voltage values for varying LEDs… and are corroborated on the website link that you provided… https://www.electronics-tutorials.ws/diode/diode_8.html
Doing the calcs… YELLOW: Voltage supplied = 3.3-2.2 (forward voltage) = 1.1V R = V / I = 1.1V / 0.02ma = 55 Ω
GREEN: ” ” ” 3.3-3.5 ( ” ” ) ” -0.2V Doesn’t this mean that there’s not enough juice to pump through from the 3v3 power tap?
You would have to use a 5V tap, right? Which would mean that we’d have to figure out own resistor measurements, right?
So… for this portion of the lab… is the YELLOW LED the LED of choice?
Your thoughts?
@Holly Lab three, “Build a Circuit”, “Equipment Needed”, 5th bubble/slide…. “Wires”. I didn’t use them as the jumper wire kit on the 9th bubble/slide facilitated the ‘jumper’ requirement. Redundant?
@Holly Disregard… Its me in my interpretation f the image.
@Holly Good afternoon again… Still going through the lab. Working on “Build a circuit”. Down towards the bottom under “Task: Build a Circuit”…7th task down “Connect to Ground”… the image shown shows the ground jumper connecting to the “positive” rail… not the “negative” rail as stated in the paragraph. Am I seeing this correctly? If so… I’m confused about HOW power is supposed to go in a circuit. Or… was this picture taken and morphed into another purpose?
@Holly Good afternoon from Suffolk, VA! Working on lab 3 (Programming). I’m in the “circuits” portion. On that page, there is a link to a video explaining the differences of DC and AC electricity. When I hit the link, it crashes the browser on the RPi. FYSA!
@Holly, @Carl…. good evening! Just writing to let you know that I received the FedEx package with the parts.
