got it to work with sleep, vcc, bme measurement and radio out

841-tinycore-micronucleus-blink/Blink.ino

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+/* -*-c++-*-
+  Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+  This example code is in the public domain.
+ */
+
+/*
+  ./hardware/ATTinyCore/avr/cores/tinymodern/core_pins.h
+  https://raw.githubusercontent.com/SpenceKonde/ATTinyCore/master/avr/extras/ATtiny_x41.png
+  Caution: reverse Pinout: PA3 => Pin 3
+
+  Nanite841 Pinout from above (ARDUINO pins in the middle):
+
+                button
+SDO/MISO PA5  5/5    4/6   PA6 SDI/MOSI
+     SCK PA4  4/6    3/7   PA7
+     CS  PA3  3/7    2/8   PB2
+     RX0 PA2  8/2   11/11  PB3
+     TX0 PA1  1/9    9/1   PB1
+         PA0 0/10   10/0   PB0
+         GND               VCC
+                 usb
+
+attiny841 pins => Arduino layout
+
+TOCC0   OC0B    pin 9 / PA1 - 841 pin 12    disabled
+TOCC1   OC0A    pin 8 / PA2 - 841 pin 11    disabled
+TOCC2   OC1B    pin 7 / PA3 - 841 pin 10
+TOCC3   OC0A    pin 6 / PA4 - 841 pin 9
+TOCC4   OC0B    pin 5 / PA5 - 841 pin 8
+TOCC5   OC1A    pin 4 / PA6 - 841 pin 7
+TOCC6   OC2B    pin 3 / PA7 - 841 pin 6
+TOCC7   OC2A    pin 2 / PB2 - 841 pin 5
+
+*/
+
+#include <avr/io.h>
+#include <util/delay.h>
+
+#define LED           10 // PB2
+
+#define SET_OUTPUT(pin) DDRB  |=  (1 << pin)
+#define SET_HIGH(pin)   PORTB |=  (1 << pin)
+#define SET_LOW(pin)    PORTB &= ~(1 << pin)
+
+void setup() {
+  uint8_t i = 0;
+  SET_OUTPUT(LED);
+  for (i=0; i<11; i++) {
+    pinMode(i, OUTPUT);
+  }
+  Serial.begin(115200);
+  Serial.println("init");
+}
+
+void loop_ard() {
+  uint8_t i = 0;
+  for (i=0; i<11; i++) {
+    Serial.print("Turning on pin: ");
+    Serial.println(i);
+    digitalWrite(i, HIGH);
+    delay(1000);
+    digitalWrite(i, LOW);
+    delay(1000);
+  }
+  delay(100);
+}
+
+void loop_man() {
+  SET_HIGH(LED);
+  delay(1000);
+  SET_LOW(LED);
+  delay(100);
+}
+
+
+void loop() {
+  loop_man();
+}

841-tinycore-micronucleus-blink/Makefile

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+# Arduino Make file. Refer to https://github.com/sudar/Arduino-Makefile
+
+# attiny841:
+#   BOARD_TAG          = attinyx41
+#   BOARD_SUB          = 841
+# attiny861:
+#   BOARD_TAG          = attinyx61
+#   BOARD_SUB          = 861
+# attiny85:
+#   BOARD_TAG          = attinyx5
+#   BOARD_SUB          = 85
+# attiny84:
+#   BOARD_TAG          = attinyx4
+#   BOARD_SUB          = 84
+
+ARDUINO_VERSION = 10810
+
+PROJECT_DIR              = $(shell pwd)
+BOARD_TAG                = attinyx41
+BOARD_SUB                = 841
+ARDUINO_DIR              = /usr/local/arduino
+ARDMK_DIR                = /usr/local/arduino/Arduino-Makefile
+MONITOR_PORT             = /dev/ttyACM0
+ISP_PORT                 = /dev/ttyACM0
+AVRDUDE                  = /usr/bin/avrdude
+ARDUINO_LIBS             = 
+ARDUINO_SKETCHBOOK       = .
+
+# mk stuff
+ALTERNATE_CORE           = ATTinyCore
+F_CPU                    = 8000000L
+MONITOR_BAUDRATE         = 115200
+AVRDUDE_ARD_PROGRAMMER   = stk500v2
+AVRDUDE_ARD_BAUDRATE     = 9600
+AVR_TOOLS_DIR            = /usr/local/avr
+AVRDUDE_CONF             = /usr/local/etc/avrdude.conf
+
+# Micronucleus
+MNINST                   = sudo micronucleus
+
+# compiler stuff
+CFLAGS_STD               = -std=gnu11
+CXXFLAGS_STD             = -std=gnu++11
+CXXFLAGS                += -pedantic -Wall -Wextra
+CURRENT_DIR              = $(shell pwd)
+
+# keep this!
+include $(ARDMK_DIR)/Arduino.mk
+
+# install using micronucleus
+install: $(TARGET_HEX) verify_size
+	@echo "########### Press RESET on the Nanite! ##############"
+	$(MNINST) $(TARGET_HEX)
+
+console:
+	screen /dev/ttyUSB0 115200

841-tinycore-micronucleus-blink/hardware

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+/usr/local/arduino/hardware